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

ASDA Mobile

On ASDA Mobile, you can now get an unlimited data plan from £20/month with access to 4G & 5G coverage from Vodafone. You can choose from three different plans, with different maximum download speed available on each one:

• The £20 unlimited data plan gives you download speeds of up to 2Mbps (equivalent to 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 can also take a long time.
• The £25 unlimited data 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 £30 unlimited data plan gives you download speeds of up to 150Mbps. You should choose this if you want to fully benefit from 5G. 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	£25.00
	Unlimited	Unlimited	Unlimited 150Mbps max	£30.00

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

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

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.

If you’re an existing BT Broadband customer, you can upgrade to BT Halo 3 online. This gives you access to home tech experts and what BT claims to be an “unbreakable broadband connection”. This consists of Hybrid Connect which gives you a 4G-based broadband backup service along with guaranteed wi-fi in every room through BT’s Complete Wi-Fi service. You’ll also get a Smart Hub 2 router and a free upgrade to BT’s full fibre broadband when it goes live at your address. Finally, you’ll unlock the ability to buy the exclusive “No Limits” SIM card for unlimited data on BT Mobile:

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

BT Mobile’s unlimited data SIM card includes access to 5G coverage if it’s available in your area. You’ll also get inclusive access to the BT Sport mobile app along with unlimited anytime phone calls on your BT landline.

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:

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

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 some Smart Benefits included on your contract:

• The £37 EE Smart unlimited data plan includes one Smart Benefit. Choose from Apple Music, BT Sport Ultimate, Amazon Prime Video, BritBox or the Roam Further Pass.
• The £41 EE Full Works unlimited data plan includes three Smart Benefits. Choose from Apple Music, Apple TV+, Apple Arcade, BT Sport Ultimate and the Roam Further Pass.

You can enjoy the inclusive Smart Benefits for the full 24 month duration of your plan.

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” (this fair usage limit was 1,000GB per month 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, read our in-depth guide 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 speed restrictions, you’ll need to choose the £35 golden goodybag on giffgaff. This gives you unlimited minutes, unlimited texts and unlimited data with uncapped download speeds on 5G.

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 4G coverage and speed restrictions, giffgaff also offers the £25 Always On data 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 per month. After the first 80GB, 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.

Customers travelling abroad to another European country can use up to 20GB of data abroad. 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 guide to unlimited data on giffgaff.

Source: giffgaff Website
Tariff Information: giffgaff Website

iD Mobile

iD Mobile is the own-brand mobile network from the Carphone Warehouse. They offer 4G coverage from Three, plus access to 5G on a selected range of Pay Monthly phones.

At present, iD Mobile offers the following unlimited data plans from £18/month:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£18.00 12 months
	Unlimited	Unlimited	Unlimited	£20.00 1 month

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 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

On Lebara Mobile, you can get a SIM Only plan with unlimited 4G data from £25/month. This plan also gives you unlimited UK minutes, unlimited UK texts and 100 international minutes to 41 countries. For an extra £5/month, you can upgrade this to an alternative plan which also comes with unlimited international minutes.

As a special offer for May 2021, Lebara Mobile is offering a £10/month discount for the first 3 months on their unlimited data plans. This means you can get unlimited data from £15/month for the first 3 months, reverting to the full price of £25/month thereafter. You can also get £10 of free credit when you transfer your existing phone number into Lebara.

There’s no contract or credit check required on Lebara so you can change or cancel your plan at any time. You’ll have access to 99% 4G coverage, powered by the Vodafone network.

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited +100 intl.	Unlimited	Unlimited	£25.00 £15 for 3 months 1 month
	Unlimited +unltd intl.	Unlimited	Unlimited	£30.00 £20 for 3 months 1 month

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, you can use a certain amount of data in Europe at no extra cost each month. This is 15.7GB on the £25 unlimited data plan and 18.8GB on the £30 unlimited data plan. You can also use up to 10GB of data abroad in India at no extra cost each month.

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

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

Lycamobile

On Lycamobile, you can buy the Go 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 £17.50/month when you order your bundle online, with this price being valid for the first 3 months. Alternatively, the bundle will cost you £30/month if you buy it elsewhere (e.g. by phone, by text message or in-store).

Lycamobile also offers the Go Unlimited Plus bundle. This costs £30 for 30 days of usage and also includes unlimited international minutes for calling 41 countries.

In the past, Lycamobile also offered a cheaper £20 Forever Data plan. The plan gave you 4G speeds on the first 9GB per month. Your download speeds would then be reduced to 128kbps for the remainder of the month (about 0.1Mbps, which is roughly equivalent to the speed of a 2G connection). The Forever Data plan is no longer available to new customers.

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 on a range of Pay Monthly SIM cards and handsets.

At present, you can get an unlimited data SIM card from £25/month, with the lowest prices being available when you choose a 24-month plan:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£25.00 24 months
	Unlimited	Unlimited	Unlimited	£30.00 24 months
	Unlimited	Unlimited	Unlimited	£33.00 12 months

You’ll get 6 months of Apple Music included on O2’s unlimited data plan. You can also choose an inclusive O2 Extra with popular options including 6 months of Disney+ or 12 months of 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 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. You can also use your SIM card abroad in 27 O2 Travel Inclusive 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, currently offering unlimited data for £16 on a one-month rolling basis. This includes an exclusive £4/month discount which is only available when you order through this link.

On SMARTY, 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	£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

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. This £20 sign-up bonus essentially makes 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 currently possible to get an unlimited data SIM card for £28/month. This is one of the best value ways of getting unlimited data with coverage from O2 and it includes access to 5G at no extra cost.

As a special time-limited offer, you’ll currently get six months of free Clubcard Plus when you sign up to this deal. This allows you to save 10% when you shop in-store at Tesco, with a maximum saving of £40/month.

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 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 a 5G-ready unlimited data plan from as little as £16/month (sometimes also referred to as an all-you-can-eat data plan).

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 Europe.

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

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£16.00 12 months
	Unlimited	Unlimited	Unlimited	£20.00 6 months half price 24 months
	Unlimited	Unlimited	Unlimited	£24.00 1 month

The cheapest way to get unlimited data on Three is through their £16 unlimited data SIM card. This is only available when you order through this link (you won’t find it if you look on the Three website). Alternatively, there’s a 24-month contract with the first 6 months half price. However, this will cost you more overall. You’ll pay £10/month for the first 6 months, followed by £20/month for the remainder of your contract (this gives an average cost of £17.50/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 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.

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, it’s now possible to get unlimited data from £25/month. This will give you 5G coverage in 100 UK towns and cities, powered by the Vodafone network.

The following table shows the unlimited data plans available from Virgin Mobile:

Network	Minutes	Texts	Data	Monthly Cost
	Unlimited	Unlimited	Unlimited	£25.00 24 months
	Unlimited	Unlimited	Unlimited	£28.00 12 months

According to Virgin, there are no restrictions on “tethering, throttling, speed restrictions or caps”. Their acceptable use policy does say that it needs to be for your own personal usage – business and commercial usage isn’t permitted. In addition, the SIM card isn’t intended to be used inside a 4G router but you can use it inside a “personal mobile or mobile broadband device”.

If you’re using your Virgin Mobile unlimited data SIM card in Europe, a fair usage limit will apply. The data roaming limit is currently 13.84GB per month on the £25 plan and 15.50GB per month on the £28 plan.

It’s no longer necessary to be a Virgin Media home broadband or TV customer to get unlimited data on Virgin Mobile. This is because Virgin Mobile’s unlimited data plan has been open to everyone since February 2021.

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

Source: Virgin Media Website
Tariff Information: Virgin Media Website

Vodafone

Vodafone offers a selection of unlimited data plans from £22/month. This gives you access to their 5G network in 100 UK towns and cities, along with 99% population coverage on 2G, 3G and 4G.

When choosing a Vodafone unlimited data plan, you’ll need to choose between three different download speeds. The cheapest £22/month Unlimited Lite plan only gives you download speeds of up to 2Mbps. Meanwhile, the £26/month Unlimited plan is capped at 10Mbps download speeds and the £30/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	£26.00 24 months
	Unlimited	Unlimited	Unlimited	£30.00 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 for £35/month.

On VOXI’s endless 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	£35.00 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 maximum amount of data you can use abroad at no extra cost is also limited to 25GB per month.

There’s no need to undergo a credit check when you join VOXI. The endless data plan also 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