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

ASDA Mobile

At present, ASDA Mobile is offering a choice of unlimited data SIM cards from £20 per month. You’ll get access to 4G & 5G coverage from Vodafone.

You can choose from three different unlimited data plans, each of which has a different maximum possible download speed:

• The £20 Unlimited Value plan gives you download speeds of up to 2Mbps. This is equivalent to the speed of a basic 3G connection. It’s enough for most day-to-day usage such as browsing the web, using messaging applications, listening to music and watching standard-definition video. However, you won’t be able to do things like streaming HD-quality video. Downloads may also take a long time on this plan.
• The £22 Unlimited Speedy plan gives you download speeds of up to 10Mbps (equivalent to a basic 4G connection). This allows you to stream in HD and to make HD-quality video calls on your phone. You’ll also get a far better experience when downloading and sharing files on your phone.
• The £24 Unlimited Superfast plan gives you download speeds of up to 150Mbps. You should choose this if you want to fully benefit from ASDA Mobile’s 5G speeds. It will allow you to do pretty much anything you’d like to do on your phone, including downloading large files and watching online video in 4K ultra-HD quality.

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

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited 2Mbps max	£20.00
	Unlimited	Unlimited	Unlimited 10Mbps max	£22.00
	Unlimited	Unlimited	Unlimited 150Mbps max	£24.00

There’s no contract and no credit check required when you order an unlimited data plan from ASDA Mobile.

For more information, see our ASDA Mobile unlimited data review.

Source: ASDA Mobile Unlimited Data Plan
Tariff Information: ASDA Mobile Website

EE

On EE, it’s currently possible to get an unlimited data plan from £27/month. The download speeds and features available will depend on the type of plan you choose.

The cheapest way to get unlimited data on EE is to get one of their No Frills unlimited data plans from £27 per month. This will have a maximum download speed of 25Mbps. This is roughly equivalent to 4G speeds:

For download speeds of up to 100Mbps and the ability to gift up to 100GB spare data to another EE SIM card on your account, you can upgrade to an EE Essentials plan from £30 per month with unlimited data:

If you’re looking for uncapped download speeds and the ability to get Inclusive Extras, choose one of EE’s All Rounder or Full Works SIM cards.

EE’s All Rounder plans come with one Inclusive Extra for the lifetime of your plan. Choose from Apple Music, Netflix, the Roam Abroad Pass, TNT Sports on discovery+, Xbox Game Pass Ultimate or Microsoft 365 Personal:

Meanwhile, EE’s Full Works plans come with three Inclusive Extras such as Apple Music, Apple TV+, Apple Arcade, TNT Sports Ultimate on discovery+ and the Roam Abroad Pass:

There are three key restrictions worth being aware on EE’s unlimited data plans:

1. There’s a fair usage limit of 600GB per month, above which 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”. For customers who signed up before the 1st September 2020, this fair usage limit was 1,000GB per month.
2. Tethering and personal hotspot usage is limited to a maximum of 12 devices.
3. You can use your allowances abroad in Europe for £2.29 per day (unless you have the Roam Abroad Pass, in which case roaming is included). A data roaming limit of 50GB per month applies when you travel abroad outside the UK.

If you’re using the Data Gifting feature on an EE Family account, you’ll be able to gift up to 100GB of data to other users on your plan (or 120GB if you’re on a 5G handset plan with unlimited data). This feature is not available on the No Frills plan.

For more information, read our EE unlimited data review.

Source: EE Website
Tariff Information: EE Website

giffgaff

giffgaff is a low-cost sub-brand of O2 with a choice of two plans that will give you unlimited data.

If you want unlimited data without speed restrictions, you’ll need to choose one of giffgaff’s £35 per month plans. This gives you unlimited minutes, unlimited texts and unlimited data. You’ll get access to uncapped download speeds on 5G.

Tariff	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£35.00 1 month
	Unlimited	Unlimited	Unlimited	£35.00 18 months

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

For a lower-cost alternative, giffgaff also offers a choice of £25 per month plans with Always-On data.

With Always-On data, you’ll get a full-speed data allowance. Depending on the plan you choose, this full-speed allowance will be either 120GB, 100GB or 80GB per month.

After the full-speed data allowance is used up, your download speeds will reduce to a maximum of 384kbps between 8am and midnight each day (about 0.4Mbps). This is roughly equivalent to the speed of a basic 3G connection. It won’t stop you from browsing the internet or sending messages through your phone but things like online video streaming are unlikely to work at this reduced speed.

Tariff	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	120GB + Always On	£25.00 18 months
	Unlimited	Unlimited	100GB + Always On	£25.00 1 month
	Unlimited	Unlimited	80GB + Always On	£25.00 1 month

Customers travelling abroad to another European country can use up to 5GB of data abroad each month. Beyond this, a surcharge of 10p/MB will be charged against your Pay As You Go balance on giffgaff.

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

Source: giffgaff Website
Tariff Information: giffgaff Website

Honest Mobile

If you’re looking for unlimited data on an “ethical mobile network”, Honest Mobile offers unlimited data plans from £22.50/month. According to Honest, they’ll also remove twice the carbon footprint of your smartphone, making it a carbon negative mobile network.

Honest Mobile offers 4G & 5G coverage from Three on the following unlimited data plans:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£22.50 12 months
	Unlimited	Unlimited	Unlimited	£25.00 1 month

There’s a 650GB per month fair usage policy, above which the speed of your service will be “limited to 3G speeds”. However, Honest says that “less than 0.2% of members use this much data”.

For more information, you can read our Honest Mobile review.

Source: Honest Mobile Plan Terms
Tariff Information: Honest Mobile Website

iD Mobile

iD Mobile is the own-brand mobile network from the Carphone Warehouse. They offer 4G & 5G coverage from Three.

At present, iD Mobile offers the following unlimited data plans from £16/month:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£16.00 24 months
	Unlimited	Unlimited	Unlimited	£16.00 1 month
	Unlimited	Unlimited	Unlimited	£17.00 12 months

iD Mobile haven’t published a fair usage policy for their unlimited data plan, but their terms and conditions say the plan is for “personal use only”. You’ll undergo a credit check when joining the iD Mobile network.

Source: iD Mobile Terms and Conditions
Tariff Information: iD Mobile Website

Lebara Mobile

On Lebara Mobile, it’s currently possible to get unlimited 5G data for just £12.50/month for 3 months (or just £11.25/month when you sign up for 12 months).

The most flexible option is Lebara’s £25 unlimited data SIM. This comes on a one-month rolling basis with no contract and no credit check. You’ll also get unlimited UK minutes, unlimited UK texts, and 100 international minutes to 42 countries. There’s no contract, so you can change or cancel your plan at any time.

As an exclusive offer for our readers in October 2023, you can get 3 months half price when you order through this link, entering KEN3 as your voucher code at checkout. This allows you to get the £25 unlimited data SIM for only £12.50 per month for 3 months.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited +100 intl.	Unlimited	Unlimited	£12.50 for 3 months, then £25/month 1 month
	Unlimited +unltd intl.	Unlimited	Unlimited	£15.00 for 3 months, then £30/month 1 month

For even bigger savings, you can sign up on a 12-month plan. This will give you a further 10% discount, bringing the price down to as little as £11.25 per month for 3 months (then £22.50 per month thereafter).

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited +100 intl.	Unlimited	Unlimited	£11.25 for 3 months, then £22.50/month 12 months
	Unlimited +unltd intl.	Unlimited	Unlimited	£13.50 for 3 months, then £27/month 12 months

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

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.

If you’re using your Lebara Mobile SIM card abroad in Europe, you can use up to 30GB of data per month at no extra cost. After the first 30GB of usage, you can choose to renew your plan early to get a fresh 30GB allowance. Alternatively, you can buy a 5GB roaming bolt-on for £10.

If you’re travelling abroad to India, you can use up to 10GB data per month at no extra cost. You’ll also get 200 minutes and 200 texts to use in India each month.

For more information, see our Lebara Mobile unlimited data review.

Source: Lebara Mobile Terms and Conditions
Tariff Information: Lebara Mobile Website

Lyca Mobile

On Lyca Mobile, it’s currently possible to get unlimited data for just £9.99/month for 6 months, then £25/month.

Lyca Mobile’s unlimited data plan comes with no contract and no credit check. You’ll also get unlimited UK minutes, unlimited UK texts and 100 international minutes included with your plan each month.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£9.99 for 6 months, then £25/month

There’s a fair use limit of 450GB per month in the UK, and 12GB per month when you’re travelling abroad in the EU. You’ll get access to 4G & 5G coverage from EE.

On Lyca Mobile, the use of tethering and personal hotspot is not permitted. For more information, see our guide to unlimited data on Lycamobile.

Source: Lyca Mobile Website
Tariff Information: Lyca Mobile Website

O2

O2 offers unlimited data on a range of Pay Monthly SIM cards and handsets.

At present, you can get an unlimited data SIM card from £30/month, with the lowest prices being available when you choose a 24-month plan:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£30.00 24 months
	Unlimited	Unlimited	Unlimited	£33.00 12 months
	Unlimited	Unlimited	Unlimited	£36.00 1 month

You’ll get up to 3 months Apple Music included, along with 3 months of a different O2 Extra of your choice (such as Disney+, Amazon Prime Video, or Amazon Music).

If you upgrade to the more expensive ‘Unlimited Plus’ plan from O2, you’ll get up to 6 months of Apple Music included, along with 6 months of another O2 Extra. You’ll also get the O2 Travel Inclusive Zone Bolt-On included when you choose an Unlimited Plus plan.

On O2’s unlimited data plan, there are several fair usage limits worth being aware of. The most important is their 650GB per month fair 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 home broadband 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. In addition, if you’re a Virgin Media customer or if you choose an Unlimited Plus plan, you’ll be able to use your SIM card abroad in a further 27 O2 Travel Inclusive Zone countries at no extra cost (subject to speed restrictions after the first 150MB of general data usage each day, or after the first 50MB of streaming data usage each day).

For more information, read our guide to O2’s unlimited data plans.

Source: O2 Website: Unlimited Plan Terms
Tariff Information: O2 Website

SMARTY

SMARTY is a low cost sub-brand of Three, currently offering unlimited data for £16 on a one-month rolling basis (this is a special offer for October 2023).

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.

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

SMARTY offers 99% population coverage, using 4G and 5G coverage from Three.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£16.00 1 month

The following table shows a summary of the key things to know about unlimited data on SMARTY:

For more information, see our SMARTY unlimited data review.

Source: SMARTY Website: Unlimited Plan
Tariff Information: SMARTY Website

Talkmobile

Talkmobile is a low-cost sub-brand of Vodafone. At present, they’re offering unlimited 5G data for just £16 per month on a one-month rolling basis, with access to Vodafone’s 5G network and the fastest available speeds. This makes it one of the best value ways of getting unlimited data on the Vodafone network.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£16.00 1 month

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.

Source: Talkmobile: Terms and Conditions
Tariff Information: Talkmobile SIM Only Deals

Tesco Mobile

On Tesco Mobile, it’s currently possible to get an unlimited data SIM card from £25/month. This comes with access to 4G & 5G coverage on the O2 network.

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

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£25.00 24 months
	Unlimited	Unlimited	Unlimited	£30.00 12 months

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

Tesco says on their website that you can use the unlimited data SIM card for personal use in mobile devices, but not in 4G home broadband routers.

For more information, see our guide to Tesco Mobile unlimited data plans.

Source: Tesco Mobile Terms and Conditions
Tariff Information: Tesco Mobile Website

Three

On Three, you can get “truly unlimited data” from £18 per month when you order through this link (reduced from the normal price of £25 per month).

There are no fair usage limits for unlimited data inside the UK. You’ll also get 5G coverage with no speed restrictions. However, commercial usage of the service is not permitted:

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.

The following table shows the best SIM-only plans from Three with unlimited data:

The cheapest way to get unlimited data on Three is through their £18 unlimited data SIM card deal. This is available exclusively when you order through this link. It’s a hidden deal so you won’t find it if you look directly on Three’s website.

Most customers will choose one of Three’s Lite plans as this will give you unlimited data for the lowest possible price. For an extra £5 per month, you can upgrade to an Unlimited Value plan which gives you Paramount+ for the first half of your plan, and 14 daily Go Roam passes each year. The Unlimited Complete plan costs £10 per month extra. It comes with Paramount+ for the entire duration of your plan, plus 28 daily Go Roam passes per year.

As well as getting an unlimited data SIM card, you can also buy a smartphone from Three with unlimited data on a contract. Three also offers unlimited 4G home broadband and unlimited 5G home broadband.

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.

Source: Three Help: What is unlimited data?
Tariff Information: Three Website

Vodafone

Vodafone offers a selection of unlimited data plans from £30/month. This gives you access to their 5G network, along with 99% population coverage on their 4G network.

When choosing a Vodafone unlimited data plan, you’ll need to choose between three different download speeds. The Unlimited Lite plan only gives you download speeds of up to 2Mbps. Meanwhile, the Unlimited plan is capped at 10Mbps download speeds and the Unlimited Max plan has uncapped 4G & 5G speeds.

There’s no fair usage policy on Vodafone’s unlimited data allowance, except that it needs to be “for your personal and non-commercial use”.

If you have an unlimited data plan with 4 Xtra benefits, you’ll also be able to use up to 25GB of data per month when travelling abroad as part of Vodafone Global Roaming.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited 10Mbps max	£30.00 24 months
	Unlimited	Unlimited	Unlimited	£33.00 24 months

Vodafone’s unlimited data plans are also available on a 12-month contract or on a 30-day rolling contract.

For more information, read our Vodafone unlimited data review.

Source: Vodafone Website
Tariff Information: Vodafone Website

VOXI

VOXI is the youth-orientated sub-brand of Vodafone. At present, they’re offering unlimited 5G data for £30/month, with no contract and no credit check required.

On VOXI’s unlimited data plan, you’ll get access to 5G coverage from Vodafone. This gives you average download speeds of 150-200Mbps on 5G, or average download speeds of 23-35Mbps on 4G. You’ll also get unlimited minutes and unlimited texts included on your plan.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£30.00 1 month

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”.

Source: VOXI: Terms and Conditions
Tariff Information: VOXI Website