Unlimited Data Plans on UK Mobile Networks: Best Unlimited Data SIM Cards

You can get an unlimited data plan from £15/month, allowing you to download as much as you like. Compare the UK’s best unlimited data SIM cards.

Whether you’re a heavy smartphone user or whether you just want the reassurance that you’ll never run out of data, most UK mobile networks now offer an unlimited data plan so you can download as much as you like without the need to worry about your usage.

In total, there are currently 17 mobile networks that offer an unlimited data plan in the UK. All of them now offer 5G coverage as standard. The cheapest unlimited data plans start from £15/month.

In this article, we’ll compare the best value unlimited data plans in the UK. We’ll start with an overview of the cheapest available deals, as well as the coverage and speeds you can expect on each network. We’ll then look at the unlimited data plans on each mobile network in more depth, including any fair usage limits or restrictions that apply.

Unlimited Data Plans:	From £15/month
Recommended Deal:	£16/month for unlimited data on Talkmobile (1-month rolling plan with Vodafone 5G coverage)
‘No Credit Check’ Deal:	£18/month for unlimited data on SMARTY (with no contract & 5G coverage from Three)
With EE Coverage:	EE (£23/month) 1pMobile (£25/month) Lyca Mobile (£18/month) Mozillion (£22/month)
With O2 Coverage:	O2 (£32/month) giffgaff (£25/month) Sky (£20/month) Tesco (£20/month)
With Three Coverage:	Three (£18/month) Honest Mobile (£22.50/month) iD Mobile (£15/month) SMARTY (£18/month)
With Vodafone Coverage:	Vodafone (£24/month) ASDA Mobile (£22/month) Lebara (£22.50/month - 3 months half price) Talkmobile (£16/month) VOXI (£20/month)

Overview of Unlimited Data Plans

Best Unlimited Data Plans

In the UK, there are currently 17 mobile networks that offer an unlimited data plan.

The following table shows the cheapest unlimited data plans that are currently available on each network:

Network	Data	Monthly Cost
Three coverage Unlimited mins Unlimited texts	Unlimited data	£15.00 per month 1 month contract	See deal
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£16.00 per month 1 month contract	See deal
Three coverage Unlimited mins Unlimited texts	Unlimited data	£18.00 per month 1 month contract	See deal
Unlimited mins Unlimited texts	Unlimited data	£18.00 per month 12 month contract Monthly cost rising to £20.30 on 1 Apr 2026	See deal
EE coverage Unlimited UK mins Unlimited UK texts 100 intl mins Offer ends 28th Feb	Unlimited data 450GB 'fair use' limit	£18.00 per month 6 months half price 24 month contract	See deal
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£19.00 per month 24 month contract	See deal
O2 coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 12 month contract	See deal
O2 coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 24 month contract Monthly cost frozen with Clubcard Prices	See deal
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 1 month rolling	See deal
EE coverage Unlimited mins Unlimited texts	Unlimited data 500GB 'fair use' limit	£22.00 per month 24 month contract	See deal
Vodafone coverage Unlimited UK mins Unlimited UK texts 100 intl mins	Unlimited data	£22.50 per month 12 month contract	See deal
Three coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£22.50 per month 12 month contract Monthly cost will drop by 5% each year	See deal
Unlimited mins Unlimited texts	Unlimited data 100Mbps max speed	£24.00 per month 24 month contract Monthly cost rising to £26.50 on 1 Apr 2026 £29.00 on 1 Apr 2027	See deal
O2 coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£25.00 per month 18 month contract	See deal
Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£32.00 per month 24 month contract Monthly cost rising to £34.50 on 1 Apr 2026 £37.00 on 1 Apr 2027	See deal

Coverage, Speeds & Limitations

When choosing an unlimited data SIM card, it’s important to consider the coverage you’ll get on it, along with any fair usage limits or restrictions.

The following table shows a summary of this information for each UK network:

Mobile Network	Coverage Provider	Speed	Key Limits & Restrictions
1pMobile	EE	5G	500GB monthly fair usage
ASDA Mobile	Vodafone	5G
EE	EE	5G	Speed restrictions may apply (10Mbps, 100Mbps or uncapped) 600GB monthly fair usage 12 devices tethering & hotspot
giffgaff	O2	5G	650GB monthly fair usage 12 devices tethering & hotspot
Honest Mobile	Three	5G	650GB monthly fair usage
iD Mobile	Three	5G
Lebara Mobile	Vodafone	5G
Lyca Mobile	EE	5G	450GB monthly fair usage No tethering & hotspot
Mozillion	EE	5G	500GB monthly fair usage
O2	O2	5G	650GB monthly fair usage 12 devices tethering & hotspot No 4G routers
Sky Mobile	O2	5G
SMARTY	Three	5G
Talkmobile	Vodafone	5G
Tesco Mobile	O2	5G	No 4G routers
Three	Three	5G
Vodafone	Vodafone	5G
VOXI	Vodafone	5G

For further information about the unlimited data plans on each network, read on to learn more about unlimited data on each network.

Unlimited Data Plans: By Mobile Network

Currently, you can get an unlimited data plan from 17 UK mobile networks. In the following section, we’ll look at the unlimited data plans on each mobile network in more detail:

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Coverage:	Uses EE network (5G) – check postcode
Unlimited Data Plans:	From £25 per month
Fair Use Limit:	500GB monthly fair usage
Reasons To Buy:	You get access to EE’s network, which is generally considered best in the UK. There’s no contract & no credit check needed.
Reasons To Avoid:	Relatively expensive compared to other UK mobile networks.

If you’re looking for unlimited data with EE coverage and with no need for a credit check, 1pMobile is offering a contract-free unlimited data plan from £25 per month:

Network	Data	Monthly Cost
EE coverage Unlimited mins Unlimited texts	Unlimited data	£25.00 per month No contract	See deal

It’s worth bearing in mind that there’s a 500GB per month fair use limit, above which your speeds may be throttled to a slower rate such as 128kbps.

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Coverage:	Uses Vodafone network (5G) – check postcode
Unlimited Data Plans:	From £19 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	Access to Vodafone’s 5G network with speeds up to 150Mbps. Pay Monthly customers get 5% back in an ASDA Rewards cashpot.
Reasons To Avoid:	Inclusive EU roaming is capped at 5GB per month.

On ASDA Mobile, it’s currently possible to get an unlimited data plan from £19 per month. This comes with access to Vodafone’s 5G network and download speeds of up to 150Mbps.

ASDA Mobile’s unlimited data plans are shown in the following table:

Network	Data	Monthly Cost
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£19.00 per month 24 month contract	See deal
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data 150Mbps max speed	£22.00 per month 1 month rolling	See deal
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£22.00 per month 12 month contract	See deal

If you choose a 12-month or 24-month Pay Monthly plan, you’ll get 5% of your monthly bill back in your Asda Rewards Cashpot. You’ll be able to convert these into vouchers to spend at an Asda store. If you choose a one-month rolling plan, this benefit does not apply.

In the past, some of ASDA’s unlimited data plans had a download speed limit of either 2Mbps or 10Mbps. Since December 2024, all of ASDA Mobile’s new unlimited data plans have offered download speeds of up to 150Mbps.

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Coverage:	Uses EE network (5G) – check postcode
Unlimited Data Plans:	From £23 per month
Fair Use Limit:	600GB monthly fair usage 12 devices tethering & hotspot
Reasons To Buy:	Savings are available for EE home broadband customers. Some plans include EU roaming, Netflix, Apple Music & other benefits.
Reasons To Avoid:	One of the most expensive ways to get unlimited data in the UK. Monthly cost will rise each March by £2.50 per month.

At the moment, most people are able to get an EE unlimited data plan from £23 per month. However, if you’re an EE home broadband customer, you’ll be able to get a discounted price through their EE One offer.

The download speeds and features available will depend on the type of plan you choose from EE:

	EE Unlimited No Frills	EE Unlimited Essentials	EE Unlimited All Rounder
Monthly Price (without broadband):	£27 per month	£23 per month	£33 per month
Monthly Price (with EE home broadband):	£12 per month	£15 per month	£24 per month
Download Speed:	Up to 10Mbps (‘basic’ speeds)	Up to 100Mbps (‘excellent’ speeds)	Fastest available (uncapped speeds)
Inclusive EU Roaming:	No	Essential Plus only (50GB per month)	Yes (50GB per month)
Inclusive Extras:	–	–	1 Inclusive Extra (All Rounder) 3 Inclusive Extras (Full Works)
Data Gifting:	No	100GB with EE Family	100GB with EE Family
Fair Use Limit:	600GB per month	600GB per month	600GB per month
Personal Hotspot:	Yes (up to 12 devices)	Yes (up to 12 devices)	Yes (up to 12 devices)
Calls & Texts:	Unlimited	Unlimited	Unlimited

All of EE’s unlimited data plans have a fair use limit of 600GB per month. If you go above this, EE reserves the right to “apply traffic management controls to deprioritise your mobile traffic during busy periods or to move you to a business plan”. In addition, tethering and personal hotspot usage is limited to a maximum of 12 devices.

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Coverage:	Uses O2 network (5G) – check postcode
Unlimited Data Plans:	From £25 per month
Fair Use Limit:	650GB monthly fair usage 12 devices tethering & hotspot
Reasons To Buy:	Plans are flexible so you can move upwards or downwards at any time. There’s no credit check so it’s easy to sign up.
Reasons To Avoid:	Inclusive EU roaming is capped at 5GB per month. O2’s network is slow and congested in many areas.

If you’re looking for unlimited data on a mobile network that gives you flexibility, you can get unlimited data on giffgaff from £25 per month. Importantly, all of their plans are flexible (so you can move upwards or downwards within their range at any time). There’s also no credit check when you sign up to their network.

To get the lowest monthly price (£25 per month), you’ll need to sign up for an 18-month contract. However, there’s also a one-month rolling plan available for £35 per month:

Plan	Data	Monthly Cost
O2 coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£25.00 per month 18 month contract	See deal
O2 coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£35.00 per month 1 month rolling	See deal

On giffgaff’s unlimited data plans, there’s a fair use limit of 650GB per month. In addition, giffgaff says you shouldn’t tether your phone to more than 12 devices at the same time.

If you’re travelling abroad to another European country, you’ll be able to use up to 5GB of data at no extra cost each month. Beyond this, a surcharge of 10p/MB will be charged against your Pay As You Go balance.

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Coverage:	Uses Three network (5G) – check postcode
Unlimited Data Plans:	From £22.50 per month
Fair Use Limit:	650GB monthly fair usage
Reasons To Buy:	B Corp certified network that offsets twice the carbon footprint of your phone.
Reasons To Avoid:	Plans are expensive, though you’ll get a small loyalty discount. Inclusive EU roaming is capped at 5 days per trip.

If you’re looking for unlimited data on an “ethical mobile network”, Honest Mobile offers unlimited data plans from £22.50/month. As a B Corp certified network, Honest says they’ll remove twice the carbon footprint of your phone, making it a ‘carbon negative’ service. You’ll get 4G and 5G coverage from Three.

Network	Data	Monthly Cost (will drop by 5% each year)
Three coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£22.50 per month 12 month contract	See deal
Three coverage Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£25.00 per month 1 month rolling	See deal

In the UK, there’s a 650GB per month fair use limit, above which your service will be “limited to 3G speeds”. You’ll also get 5 days of inclusive EU roaming per trip (up to a maximum of 20GB data per month).

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Coverage:	Uses Three network (5G) – check postcode
Unlimited Data Plans:	From £15 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	You can get super-low prices when you take advantage of iD’s hidden deals. Use up to 30GB per month at no extra cost in 50 destinations.
Reasons To Avoid:	You’ll need to undergo a credit check when you sign up for iD Mobile. Patchy coverage in some areas, but gradually getting access to Vodafone..

One of the cheapest ways to get unlimited data in the UK is currently with iD Mobile’s £15 unlimited data plan.

Network	Data	Monthly Cost
Three coverage Unlimited mins Unlimited texts	Unlimited data	£15.00 per month 1 month contract	See deal
Three coverage Unlimited mins Unlimited texts	Unlimited data	£17.00 per month 6 months half price 24 month contract	See deal
Three coverage Unlimited mins Unlimited texts	Unlimited data	£18.00 per month 3 months half price 12 month contract	See deal

One of the benefits of iD Mobile is you get a generous allowance of inclusive EU roaming, allowing you to use up to 30GB data per month abroad in 50 destinations at no extra cost. They’re also part of the Currys group, so they’re established and well-known brand. There are no annual price rises when you sign up on a SIM-only plan.

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Coverage:	Uses Vodafone network (5G) – check postcode
Unlimited Data Plans:	From £22.50 per month
Fair Use Limit:	No (subject to general T&Cs)
Reasons To Buy:	Access to Vodafone’s 5G network with the fastest available speeds. Get 3 months half price with the KEN3 voucher code at checkout. Use up to 30GB data per month in Europe & India at no extra cost.
Reasons To Avoid:	Not the cheapest option when the ‘3 months half price’ runs out.

On Lebara Mobile, it’s possible to get unlimited data for just £12.50 per month for the first 3 months. This is a one-month rolling plan with no contract and no credit check.

To get this offer, simply order your plan through this link and enter KEN3 as your voucher code during checkout. As there’s no contract, you can cancel any time.

Network	Data	Monthly Cost
Vodafone coverage Unlimited UK mins Unlimited UK texts 100 intl mins	Unlimited data	£12.50 for 3 months, then £25 per month 1 month rolling	See deal
Vodafone coverage Unlimited UK mins Unlimited UK texts Unlimited intl mins	Unlimited data	£15.00 for 3 months, then £30 per month 1 month rolling	See deal

For an additional 10% saving, you can sign up to Lebara Mobile on a 12-month plan. This will bring the price down to just £11.25 per month for 3 months (then £22.50 per month thereafter).

Network	Data	Monthly Cost
Vodafone coverage Unlimited UK mins Unlimited UK texts 100 intl mins	Unlimited data	£11.25 for 3 months, then £22.50 per month 12 month contract	See deal
Vodafone coverage Unlimited UK mins Unlimited UK texts Unlimited intl mins	Unlimited data	£13.50 for 3 months, then £27 per month 12 month contract	See deal

As before, you’ll need to enter KEN3 as your voucher code at checkout to get the 3 months half price.

According to Lebara Mobile, there are no usage caps on their unlimited data service, with exceptions for fraudulent usage and their general terms and conditions:

Where Unlimited data is included in a plan allowance, there is no data cap, subject to fraud exceptions. All general T&C will apply.

On Lebara’s unlimited data plan, you can use up to 30GB data per month at no extra cost when you’re abroad in Europe and India.

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Coverage:	Uses EE network (5G) – check postcode
Unlimited Data Plans:	From £18 per month
Fair Use Limit:	450GB monthly fair usage (128kbps speed cap thereafter)
Reasons To Buy:	You get access to EE’s network, which is generally considered best in the UK. Use up to 35GB data per month in Europe & India at no extra cost.
Reasons To Avoid:	Download speeds are capped at 128kbps after you use 450GB data. Monthly prices go up after the introductory period.

On Lyca Mobile, you can get unlimited data from £9/month for 6 months,
then £18 per month. You’ll also get unlimited UK minutes, unlimited UK texts and 100 international minutes included on this plan.

Network	Data	Monthly Cost
EE coverage Unlimited UK mins Unlimited UK texts 100 intl mins Offer ends 28th Feb	Unlimited data 450GB 'fair use' limit	£9.00 for 6 months, then £18 per month 24 month contract	See deal
EE coverage Unlimited UK mins Unlimited UK texts 100 intl mins Offer ends 28th Feb	Unlimited data 450GB 'fair use' limit	£11.00 for 3 months, then £22 per month 12 month contract	See deal
EE coverage Unlimited UK mins Unlimited UK texts 100 intl mins Offer ends 28th Feb	Unlimited data 450GB 'fair use' limit	£12.00 for 1 month, then £24 per month 1 month contract	See deal
EE coverage Unlimited UK mins Unlimited UK texts 100 intl mins Offer ends 28th Feb	Unlimited data 450GB 'fair use' limit	£12.50 for 1 month, then £25 per month 1 month rolling	See deal

There’s a fair use limit of 450GB per month in the UK, above which the speed of your service will reduce to 128Kbps. You can use up to 35GB data per month at no extra cost when you’re travelling abroad in the EU. You’ll get access to 4G & 5G coverage from EE.

For more information, see our guide to unlimited data on Lyca Mobile.

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Coverage:	Uses EE network (5G) – check postcode
Unlimited Data Plans:	From £22 per month
Fair Use Limit:	500GB monthly fair usage
Reasons To Buy:	You get access to EE’s network, which is generally considered best in the UK.
Reasons To Avoid:	Relatively expensive compared to other UK mobile networks. A relatively new mobile network, with limited track record.

Mozillion offers unlimited data with EE coverage on the following plans from £22 per month:

Network	Data	Monthly Cost
EE coverage Unlimited mins Unlimited texts	Unlimited data	£22.00 per month 24 month contract	See deal
EE coverage Unlimited mins Unlimited texts	Unlimited data	£22.50 per month 12 month contract	See deal
EE coverage Unlimited mins Unlimited texts	Unlimited data	£23.00 per month 1 month contract	See deal

There’s a 500GB per month fair use limit on their unlimited data plans.

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Coverage:	Uses O2 network (5G) – check postcode
Unlimited Data Plans:	From £32 per month
Fair Use Limit:	650GB monthly fair usage 12 devices tethering & hotspot No 4G routers
Reasons To Buy:	Selected plans come with O2 Extras such as Disney+ and Amazon Prime. Virgin Media customers can get Volt benefits on their broadband & SIM.
Reasons To Avoid:	O2’s network is slow and congested in many areas.

If you’re looking for an O2 unlimited data plan, it’s currently possible to get an unlimited data SIM from £32 per month, with the lowest prices available when you choose a 24-month plan:

Network	Data	Monthly Cost
Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£32.00 per month 24 month contract Monthly cost rising to £34.50 on 1 Apr 2026 £37.00 on 1 Apr 2027	See deal
Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£35.00 per month 12 month contract Monthly cost rising to £37.50 on 1 Apr 2026	See deal
Unlimited mins Unlimited texts	Unlimited data 650GB 'fair use' limit	£38.00 per month 1 month contract Monthly cost will rise each April by £2.50	See deal

These plans come with 3 months of an inclusive O2 Extra (such as Disney+ Standard or Amazon Prime). In addition, if you’re a Virgin Media customer, you can unlock Volt customer benefits such as inclusive roaming in 75 worldwide destinations and boost Virgin Media speeds.

There are several fair usage limits worth being aware of on O2’s unlimited data plan. The most important is their 650GB per month data usage limit. In addition, the use of tethering and personal hotspot is limited to a maximum of 12 devices. If you exceed these limits twice in any six-month period, O2 says they “reserve the right to transfer you to a more suitable plan”.

O2’s terms and conditions also require you to use their unlimited data SIM card inside a battery-powered mobile device. This is intended to prevent you from using the SIM card for 4G or 5G home broadband:

3.3 Unlimited UK Data sold on handset or SIMO contracts must only be used in mobile devices that do not require to be plugged in order to work. Any O2 mobile broadband Unlimited UK Data tariffs must only be used with the devices that they are sold with. Where other devices are used that do not comply with these terms, we reserve the right to transfer you to a more suitable plan.

If you’re travelling abroad to another European country, you can use up to 25GB of data abroad in O2 Europe Zone countries.

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Coverage:	Uses O2 network (5G) – check postcode
Unlimited Data Plans:	From £20 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	Upgrade or downgrade your plan at any time within Sky’s SIM-only range. Access to the Sky VIP loyalty rewards programme.
Reasons To Avoid:	Plans have a minimum 12-month contract & require a credit check. Sky uses the O2 network, which can be slow and congested in some areas.

On Sky Mobile, it’s currently possible to get an unlimited data plan for £20 per month. This will give you access to O2’s 4G and 5G network.

Network	Data	Monthly Cost
O2 coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 12 month contract	See deal

According to Sky, their unlimited data plan is for “personal use only”. Their terms and conditions state that your usage of the plan “should not exceed that reasonably expected of a reasonable person using the Sky Mobile services for personal purposes as a consumer”.

Sky’s data rollover feature (Sky Piggybank) is not available on unlimited data plans.

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Coverage:	Uses Three network (5G) – check postcode
Unlimited Data Plans:	From £18 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	You’ll get the fastest available speeds on Three, with no fair use limit. Use your plan at no extra cost in the EU (up to 12GB per month). There’s no contract, no credit check & no annual price rises.
Reasons To Avoid:	This discounted price is only available to new SMARTY Mobile customers.

SMARTY is a low cost sub-brand of Three. They currently offer unlimited data for £18 on a one-month rolling basis (this is a special offer that’s running in February 2026).

On SMARTY, you’ll get unlimited minutes, unlimited texts and unlimited 5G data. You can also use the unlimited data SIM card in other devices like your tablet, dongle or mobile broadband router.

Network	Data	Monthly Cost
Three coverage Unlimited mins Unlimited texts	Unlimited data	£18.00 per month 1 month contract	See deal

According to SMARTY, tethering and personal hotspot usage is included in the plan and there are no speed restrictions for using too much data. However, there’s a fair use limit of 12GB per month when you’re using your SMARTY SIM card abroad in Europe.

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Coverage:	Uses Vodafone network (5G) – check postcode
Unlimited Data Plans:	From £16 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	A great price for an unlimited data SIM card on a 30-day contract. Access to Vodafone’s 5G network with the fastest available speeds. Use your plan at no extra cost in the EU (up to 5GB per month).
Reasons To Avoid:	You’ll need to go through an ID check when you sign up for Talkmobile.

Talkmobile is a low-cost sub-brand of Vodafone. As a special offer for February 2026, they’re offering unlimited 5G data for just £16 per month on a one-month rolling basis. You’ll get access to Vodafone’s 5G network with their fastest available speeds on this deal.

Network	Data	Monthly Cost
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£16.00 per month 1 month contract	See deal

According to their terms and conditions, Talkmobile says the plan “is for personal use only and cannot be used for commercial or business purposes”. However, beyond that, there are no hidden limits on how much data you can use.

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Coverage:	Uses O2 network (5G) – check postcode
Unlimited Data Plans:	From £20 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	Earn Clubcard points on your Tesco Mobile spend.
Reasons To Avoid:	Plans have a minimum 12-month contract & require a credit check. Tesco uses the O2 network, which can be slow and congested in some areas.

On Tesco Mobile, it’s currently possible to get an unlimited data SIM card from £20/month. This comes with access to 4G & 5G coverage from O2.

The following table shows Tesco Mobile’s unlimited data SIM cards:

Network	Data	Monthly Cost
O2 coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 24 month contract Monthly cost frozen with Clubcard Prices	See deal
O2 coverage Unlimited mins Unlimited texts	Unlimited data	£30.00 per month 12 month contract Monthly cost will rise each April	See deal

Tesco hasn’t set a fair usage limit for their unlimited data plan. Instead, their terms and conditions state that you’re unable to use the service for commercial purposes, or for any usage that adversely impacts other customers on their network.

Tesco says on their website that you can use the unlimited data SIM card for “personal use” in mobile devices, but you can’t use it for 4G home broadband.

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Coverage:	Uses Three network (5G) – check postcode
Unlimited Data Plans:	From £18 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	You’ll get the fastest available 5G speeds, with no fair use limit. Access to Three+ rewards such as a £1 coffee and discounted cinema tickets.
Reasons To Avoid:	‘Unlimited Lite’ plans no longer include EU roaming at no extra cost.

Historically, Three has stood out amongst the four major UK networks in being the main champion of unlimited data plans in the UK. This dates back to their heritage of offering ‘all-you-can-eat data’ plans since 2010.

Today, Three is still the best option if you’re looking for a “big name” mobile network that gives you truly unlimited data, with 5G speeds and no fair use limits. When you take advantage of their exclusive deals, you can get unlimited data from just £18 per month:

Plan	Data	Monthly Cost
Lite Unlimited mins Unlimited texts	Unlimited data	£18.00 per month 12 month contract Monthly cost rising to £20.30 on 1 Apr 2026	See deal
Value Unlimited mins Unlimited texts	Unlimited data Roam in 49 European destinations (12GB per month) 12 months Paramount+	£27.00 per month 24 month contract Monthly cost will rise each April by £2.30	See deal
Lite Unlimited mins Unlimited texts	Unlimited data	£32.00 per month 1 months half price 1 month contract Monthly cost will rise each April by £2.30	See deal

The cheapest way to get unlimited data on Three is by choosing the ‘Unlimited Lite’ plan. However, this does not come with inclusive EU roaming. You can upgrade to their Unlimited Value plan for inclusive EU roaming, or their Unlimited Complete plan for inclusive roaming in 180 worldwide destinations.

Prior to September 2019, Three had a fair usage policy of 1,000GB per month (1TB) on their unlimited data plans. They’ve confirmed that this fair usage policy no longer applies on their plans:

If you have Unlimited Data as part of your package or with an Add-on, there are no hidden caps or limits when using your device within the UK. Unlimited Data lets you use the internet to your heart’s content, without worrying about hefty bills.

Use of our services for commercial, resale or fraudulent purposes isn’t allowed under our Terms for Three Services, so we do reserve the right to monitor any unusual activity that may indicate that this is happening to identify and prevent such non-permitted use.

For more information, see our guide to unlimited data on Three.

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Coverage:	Uses Vodafone network (5G) – check postcode
Unlimited Data Plans:	From £24 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	Access to exclusive VeryMe Rewards with weekly offers and freebies. Selected ‘Xtra’ plans come with inlusive EU roaming and Global Roaming.
Reasons To Avoid:	There’s a 24-month contract on the most competitively priced deals.

On Vodafone, you can choose from a range of ‘Unlimited Plus’ plans (with download speeds of up to 100Mbps) and ‘Unlimited Max’ plans (with uncapped speeds). Prices vary depending on the type of plan, but you’ll normally need to sign up for 24 months to get the best available price:

Network	Data	Monthly Cost
Unlimited mins Unlimited texts	Unlimited data 100Mbps max speed	£24.00 per month 24 month contract Monthly cost rising to £26.50 on 1 Apr 2026 £29.00 on 1 Apr 2027	See deal
Unlimited mins Unlimited texts	Unlimited data	£36.00 per month 24 month contract Monthly cost rising to £38.50 on 1 Apr 2026 £41.00 on 1 Apr 2027	See deal

For inclusive roaming in 51 European destinations, you can upgrade to one of their ‘Unlimited Xtra Euro Roam’ plans. These start from £40 per month, with up to 25GB per month of inclusive EU roaming:

Network	Data	Monthly Cost
Unlimited mins Unlimited texts	Unlimited data 100Mbps max speed 25GB data in 51 EU destinations	£40.00 per month 24 month contract Monthly cost rising to £42.50 on 1 Apr 2026 £45.00 on 1 Apr 2027	See deal
Unlimited mins Unlimited texts	Unlimited data 25GB data in 51 EU destinations	£43.00 per month 24 month contract Monthly cost rising to £45.50 on 1 Apr 2026 £48.00 on 1 Apr 2027	See deal

There are also ‘Unlimited Xtra Global Roam’ plans that give roaming in 83 worldwide destinations at no extra cost. As well as covering the European destinations, you’ll get inclusive roaming in Australia, Turkey, Mexico, the USA and more:

Network	Data	Monthly Cost
Unlimited mins Unlimited texts	Unlimited data 100Mbps max speed 25GB data in 83 global destinations	£44.00 per month 24 month contract Monthly cost rising to £46.50 on 1 Apr 2026 £49.00 on 1 Apr 2027	See deal
Unlimited mins Unlimited texts	Unlimited data 25GB data in 83 global destinations	£47.00 per month 24 month contract Monthly cost rising to £49.50 on 1 Apr 2026 £52.00 on 1 Apr 2027	See deal

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Coverage:	Uses Vodafone network (5G) – check postcode
Unlimited Data Plans:	From £20 per month
Fair Use Limit:	No (personal use only)
Reasons To Buy:	30-day subscription with no contract & no credit check (cancel any time). Access to Vodafone’s 5G network with the fastest available speeds. Access to VOXI Drop rewards, including monthly offers and freebies.
Reasons To Avoid:	EU roaming is not included and will cost you up to £2.60 per day.

It’s also possible to get unlimited data from VOXI, which is the low-cost, contract-free sub-brand of Vodafone. On VOXI, there’s no credit check needed and you can get instant delivery on a VOXI eSIM.

Network	Data	Monthly Cost
Vodafone coverage Unlimited mins Unlimited texts	Unlimited data	£20.00 per month 1 month rolling	See deal

According to their terms and conditions, VOXI says they “reserve the right to suspend or throttle the service if we have reason to believe that the SIM card is being used for commercial purposes, fraudulently or is having an adverse impact / damaging our network in any way”.

Alternatives to Unlimited Data

In some cases, it might not actually be necessary to choose a plan with unlimited data. This is because the average UK mobile user only consumes around 10GB of data per month.

If you mainly want the reassurance that you’ll never run out of data, consider something like SMARTY's 80GB plan. This already has more than enough data for the average user.

Network	Data	Monthly Cost
Three coverage Unlimited mins Unlimited texts	40GB data	£8.00 per month 1 month contract	See deal
Three coverage Unlimited mins Unlimited texts	70GB data	£9.00 per month 1 month contract	See deal
Three coverage Unlimited mins Unlimited texts	80GB data	£10.00 per month 1 month contract	See deal

Alternatively, if you just want unlimited data for use on certain apps, consider VOXI’s unlimited social media (from £10/month), unlimited music (from £12/month), or unlimited video (from £15/month). This will give you unlimited data for use in the following applications:

• Unlimited social media includes: Facebook, WhatsApp, Snapchat, Twitter, Instagram, Facebook Messenger & Pinterest
• Unlimited music includes: Spotify, Apple Music, Amazon Music, TIDAL, Deezer, Napster & Primordial Radio
• Unlimited video includes: TikTok, YouTube, Netflix, Amazon Prime Video & My5

Network	Data	Monthly Cost
Vodafone coverage Unlimited mins Unlimited texts	80GB data Unlimited Social Media	£10.00 per month 1 month rolling	See deal
Vodafone coverage Unlimited mins Unlimited texts	100GB data Unlimited Social Media Unlimited Music	£12.00 per month 1 month rolling	See deal
Vodafone coverage Unlimited mins Unlimited texts	140GB data Unlimited Social Media Unlimited Music Unlimited Video	£15.00 per month 1 month rolling	See deal

For more information, see our comparison of the best SIM-only deals in the UK.

More Information

For more information about a specific unlimited data plan, please see the details on your mobile network’s website. We’ve also got in-depth guides to unlimited data on ASDA Mobile, EE, giffgaff, iD Mobile, Lebara Mobile, Lyca Mobile, O2, SMARTY, Three and Vodafone.

If you’re looking for a wider range of deals, compare SIM-only plans including those without an unlimited data allowance.