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

BT Mobile

On BT Mobile, you can get a No Limits SIM card for £20/month. However, this is only available if you have BT Halo which is BT’s flagship fibre broadband plan.

BT Halo is available from an extra £3/month above the cost of your normal BT Broadband plan and gives you access to home tech experts along with an upgraded BT Smart Hub 2 router and BT’s Keep Connected promise where they’ll send you a 4G Mini Hub if your broadband service goes down. You’ll also unlock the ability to buy the exclusive “No Limits” SIM card which gives you unlimited data with access to 5G on BT Mobile:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£20.00 24 months
	Unlimited	Unlimited	Unlimited	£25.00 12 months

If you’re not already a BT Halo customer, you’ll need to sign up for Halo at the same time as ordering your No Limits SIM card. Be aware that you might need to extend your BT Broadband contract when upgrading to a plan with Halo.

On BT’s unlimited data SIM card, there is no fair usage limit for the service. This is confirmed in BT’s help centre:

Is there a fair usage policy for BT Mobile?
There’s no fair usage policy. So when we say “unlimited”, it truly is unlimited.

The only exception to this is when you’re travelling abroad to another European country that’s part of BT’s Roam Like Home offer. In these 47 European Roam Like Home destinations, you’ll only be able to use 50GB of data abroad at no extra cost.

This information is summarised in the following table:

Source: BT Website: No Limits on Halo
Tariff Information: BT Mobile Website

EE

On EE, you can get an unlimited data plan with 5G speeds from £37/month.

When you choose an unlimited data plan on EE, you’ll get either one Smart Benefit or three Smart Benefits included in the price. This gives you an inclusive subscription for the length of your contract to services like Apple Music, BT Sport Ultimate, BritBox, Amazon Prime Music, Apple TV+, Apple Arcade or the EE Roam Further Pass.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£37.00 24 months
	Unlimited	Unlimited	Unlimited	£41.00 24 months

There are three key restrictions 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” (this fair usage limit was 1,000GB for customers who signed up before the 1st September 2020).
2. Tethering and personal hotspot usage is limited to a maximum of 12 devices.
3. A data roaming limit of 50GB per month applies when you’re travelling abroad outside the UK.

In addition, if you’re using the Data Gifting feature on an EE Family account, you’ll only 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).

For more information, you can read our in-depth to unlimited data on EE.

Source: EE Website
Tariff Information: EE Website

giffgaff

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

If you want unlimited data without any speed restrictions, you’ll need to choose the £35 golden goodybag on giffgaff. This gives you unlimited minutes, unlimited texts and unlimited data without any speed restrictions. At present, this will give you 4G coverage from O2, but you’ll also get access to 5G when it launches on giffgaff.

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

On the £35 golden goodybag, there’s a fair usage policy of 650GB per month. In addition, giffgaff also says you shouldn’t tether your phone to more than 12 devices at the same time.

If you want a lower-cost alternative with some speed restrictions, giffgaff also offers the £25 Always On goodybag. This gives you unlimited minutes, unlimited texts and Always On data:

Tariff	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Always-On	£25.00 1 month

With Always-On data, you’ll get 4G download speeds on the first 80GB of data usage each month. After the first 80GB, your download speeds will reduce to a maximum of 384kbps between 8am and midnight each day. 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 speed.

Customers travelling abroad to another European country can use up to 20GB of their unlimited data or Always-On plan each month. Beyond this, a surcharge of 0.36p/MB will be charged against your Pay As You Go balance on giffgaff.

For more information, see our guides to giffgaff’s golden goodybags and Always On data.

Source: giffgaff Website
Tariff Information: giffgaff Website

iD Mobile

iD Mobile is the own-brand mobile network from the Carphone Warehouse. Offering 3G & 4G coverage from Three, iD Mobile offers the following unlimited data plans from £16/month:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£16.00 12 months
	Unlimited	Unlimited	Unlimited	£20.00 12 months

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

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

Lebara Mobile

You can get a Lebara Mobile SIM Only plan with unlimited 4G data for £35/month, with 3 months half price. This also gives you unlimited UK minutes, unlimited UK texts and unlimited international minutes to 41 countries.

You’ll get 4G coverage from the Vodafone network when using a Lebara Mobile SIM card:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£35.00 3 months half price 1 month

On Lebara Mobile, you’ll be able to get unlimited data on a one-month rolling basis. There are no credit checks required to join Lebara Mobile and you can also get £10 of free credit when you port in your existing phone number to the network.

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, it’s possible to use up to 16.6GB of data at no extra charge in Europe. You can also use up to 10GB of data abroad in India at no extra cost.

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

Lycamobile

On Lycamobile, you can buy the UK Plan Unlimited bundle which costs £25 for 30 days of usage. This gives you unlimited UK minutes, unlimited UK texts and unlimited UK data, with 99% 4G coverage from O2’s network. You can benefit from an introductory price of £19/month when you order your bundle online, which is valid for the first 90 days. Alternatively, the bundle will cost you £30/month if you buy it elsewhere (e.g. by phone, by text message or in-store).

As a cheaper alternative, there’s also a £20 Forever Data plan on Lycamobile. This gives you unlimited UK minutes, unlimited UK texts and Forever UK Data. On this plan, 4G speeds are only available on the first 9GB per month. Your download speeds will then be reduced to 128kbps for the remainder of the month (this is around 0.1Mbps, which is roughly equivalent to the speed of a 2G connection).

On Lycamobile, the use of tethering and personal hotspot is not permitted. There’s more information in our Lycamobile review.

Source: Lycamobile Website
Tariff Information: Lycamobile Website

O2

O2 offers unlimited data, or what they call limitless data, on a range of Pay Monthly handsets and SIM cards. You can get an unlimited data SIM card from £33/month with the lowest prices being available on an 18-month plan:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£33.00 18 months
	Unlimited	Unlimited	Unlimited	£35.00 12 months

This comes with 6 months of free Disney+ or a different O2 Extra of your choice (e.g. Amazon Prime Video). You’ll also get access to discounts and offers through the O2 Priority app.

When choosing an unlimited data plan on O2, 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 the unlimited data SIM card to be used in a battery-powered device. This is intended to prevent the SIM card from being used in a 4G home broadband router:

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 20GB of data abroad in O2 Europe Zone countries.

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, offering unlimited data for £20 on a one-month rolling basis. You’ll get unlimited minutes, unlimited texts and unlimited 4G data. You can also use the unlimited data SIM card in other devices like your tablet, dongle or 4G 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 usage limit of 20GB per month when you’re using your mobile phone abroad in Europe.

SMARTY offers 99% population coverage, using 3G and 4G coverage from Three.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£20.00 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

Superdrug Mobile

On Superdrug Mobile, unlimited data is available for £20/month with no contract.

The network, which offers 3G & 4G coverage from Three, will give you £20 back in Superdrug Health & Beautycard points when you sign up for Superdrug Mobile. This £20 sign-up bonus will essentially make your first month free as you’ll get the £20 back to spend on your next visit to Superdrug.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£20.00 1 month

As a customer of Superdrug Mobile, you’ll also earn double Health & Beautycard points on all of your spending at Superdrug.

On Superdrug Mobile, there are no fair usage limits or speed restrictions for unlimited data. However, they say commercial use isn’t permitted with them reserving the right to monitor your usage of the service:

6.29 If you have unlimited data as part of your Plan, there are no hidden caps or limits when using your device within the UK. Unlimited data should give you all the access to the internet you would normally need, without worrying, so you can use our service to your heart’s content. Use of the Services for commercial, resale or fraudulent purposes isn’t allowed under this Agreement, 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 Superdrug Mobile review.

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

Tesco Mobile

On Tesco Mobile, it’s possible to get an unlimited data SIM card from £28/month. This comes with coverage from the O2 network, including access to 5G if you choose a 5G-ready SIM card.

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

Network	Minutes	Texts	Data	Monthly Cost
	5,000	5,000	Unlimited	£28.00 18 months
	5,000	5,000	Unlimited	£30.00 12 months

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.

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

Three

On Three, you can get a 5G-ready unlimited data plan from as little as £18/month (this is sometimes also referred to as all-you-can-eat data).

There are no fair usage limits for unlimited data in the UK. 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.

A fair usage limit applies when you’re using your mobile phone abroad in a Go Roam country. You can use up to 20GB of data abroad in other European countries and up to 12GB of data abroad outside of Europe.

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

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£18.00 12 months
	Unlimited	Unlimited	Unlimited	£20.00 6 months half price 24 months
	Unlimited	Unlimited	Unlimited	£24.00 1 month

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 an unlimited 4G home broadband service and 5G home broadband service.

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.

Prior to October 2018, Three’s unlimited data plans also had a restriction on tethering. During the time period when this restriction was in place, it was only possible to use up to 30GB of data through tethering each month. This restriction has now been removed for all new and existing customers as a result of Ofcom’s net neutrality rules.

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

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

Virgin Mobile

On Virgin Mobile, an unlimited data plan with 4G coverage is available but this is exclusive to customers who have Virgin Media TV or broadband at home. Prices start from £27/month for unlimited data on Virgin Mobile. This also includes unlimited minutes, unlimited texts and 4G coverage from EE:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£27.00 24 months
	Unlimited	Unlimited	Unlimited	£30.00 12 months

According to Virgin, there are no restrictions on “tethering, throttling, speed restrictions or caps”.

Download speeds of up to 85Mbps are available on Virgin Mobile, currently using 4G coverage from the EE network. In May 2020, Virgin Media announced their intention to merge with O2. Following the merger which is expected to complete in 2021, Virgin Mobile is expected to migrate their mobile service to use coverage from O2.

If you’re using your Virgin Mobile unlimited data SIM card in Europe, a fair usage limit currently applies. This limit is 14.95GB per month on the 24-month plan and 16.61GB per month on the 12-month plan.

Source: Virgin Media Website
Tariff Information: Virgin Media Website

Vodafone

Vodafone offers a selection of unlimited data plans from £22/month with access to Vodafone’s 5G network in places where 5G coverage available.

When choosing an unlimited data plan from Vodafone, you’ll need to decide on the maximum speed of your plan. The cheapest £22/month Unlimited Lite plan only gives you download speeds of up to 2Mbps. Meanwhile, the £22/month Unlimited plan is capped at 10Mbps download speeds and the £26/month 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”. You can use up to 25GB of data each month when travelling abroad as part of Vodafone Global Roaming.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited 2Mbps max	£22.00 24 months
	Unlimited	Unlimited	Unlimited 10Mbps max	£22.00 24 months
	Unlimited	Unlimited	Unlimited	£26.00 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 a low-cost sub-brand of Vodafone, offering endless 5G data with no contract for £30/month.

On VOXI’s endless data plan, you’ll get 5G coverage from Vodafone. This gives you average download speeds of 150-200Mbps with 5G, or download speeds of 23-35Mbps if you’re connected to 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”. The amount of data you can use abroad at no extra charge is limited to 25GB per month.

There’s no need to undergo a credit check to join VOXI. The endless data plan works on a one-month rolling basis so you can change it or cancel it at any time.

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