MoneySavingExpert Founder, Martin Lewis · Editor-in-Chief, Marcus Herbert Chair, Martin Lewis · Editor, Marcus Herbert

Cheap Unlimited data Sims

Here are the cheapest deals on Sims (the chip in your phone that dictates your data, calls and texts allowance).

Sim card
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Your top deals

● Currently your filters are set to UnltdUnltd data, 200+ mins and 500+ texts - but you can change them to suit you.
● These are today's prices, but providers often increase prices in line with inflation or a set % during the contract.
● All deals are for new customers. Existing customer? Call your provider to see if it'll offer you it (see haggling help).

Do you really need unlimited data?

There are cheaper options available for 100GB data packages.

UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
£75 Gift card
RewardGift card
Monthly cost
£18/mth
Equiv cost:Equivalent cost incl reward: 
£11.75/mth
iD Mobile
Customer service
Uses the Three network
iD Mobile
Customer service
Uses the Three network
Get deal*
Via iD Mobile
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
£40
Automatic cashback
Monthly cost
£17/mth
Equiv cost:Equivalent cost incl cashback: 
£13.67/mth
Three
Customer service
Three
Customer service
Available from 2 retailers
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
PAYG
Monthly cost
£15/mth
Asda
Customer service
Uses the Vodafone network
Asda
Customer service
Uses the Vodafone network
Get deal*
Via Asda
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
1mthContract
Monthly cost
£16/mth
Smarty
Customer service
Uses the Three network
Smarty
Customer service
Uses the Three network
Get deal*
Via Smarty
UnltdUnltd
Data
UnltdUnltd Minutes
UnltdUnltd Texts
1mthContract
Monthly cost
£17/mth
iD Mobile
Customer service
Uses the Three network
iD Mobile
Customer service
Uses the Three network
Get deal*
Via Carphone Warehouse
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
24mthContract
£105
Automatic cashback
Monthly cost
£22/mth
Equiv cost:Equivalent cost incl cashback: 
£17.63/mth
Vodafone
Customer service
Vodafone
Customer service
Available from 2 retailers
UnltdUnltd
Data
UnltdUnltd Minutes
UnltdUnltd Texts
24mthContract
£75
Automatic cashback
Monthly cost
£22/mth
Equiv cost:Equivalent cost incl cashback: 
£18.88/mth
Vodafone
Customer service
Vodafone
Customer service
Get deal*
Via Carphone Warehouse
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
PAYG
Monthly cost
£20/mth
Asda
Customer service
Uses the Vodafone network
Asda
Customer service
Uses the Vodafone network
Get deal*
Via Asda
UnltdUnltd
Data
UnltdUnltd Minutes
UnltdUnltd Texts
PAYG
Monthly cost
£20/mth
iD Mobile
Customer service
Uses the Three network
iD Mobile
Customer service
Uses the Three network
Get deal*
Via iD Mobile
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
1mthContract
Monthly cost
£20/mth
iD Mobile
Customer service
Uses the Three network
iD Mobile
Customer service
Uses the Three network
Get deal*
Via e2save
UnltdUnltd
Data
UnltdUnltd Minutes
UnltdUnltd Texts
1mthContract
Monthly cost
£20/mth
Superdrug
Unrated service
Uses the Three network
No Wi-Fi calling 
Superdrug
Unrated service
Uses the Three network
Get deal
Via Superdrug
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
£60
Automatic cashback
Monthly cost
£25/mth
Equiv cost:Equivalent cost incl cashback: 
£20/mth
Vodafone
Customer service
Vodafone
Customer service
Get deal*
Via Carphone Warehouse
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
24mthContract
£120
Automatic cashback
Monthly cost
£25/mth
Equiv cost:Equivalent cost incl cashback: 
£20/mth
Vodafone
Customer service
Vodafone
Customer service
Get deal*
Via Carphone Warehouse
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
£50
Automatic cashback
Monthly cost
£25/mth
Equiv cost:Equivalent cost incl cashback: 
£20.84/mth
Vodafone
Customer service
Vodafone
Customer service
Available from 2 retailers
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
24mthContract
Months 1-6
£12/mth
Months 7-24
£24/mth
Equiv cost:Equivalent cost: 
£21/mth
Three
Customer service
Three
Customer service
Get deal*
Via Three
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
Monthly cost
£22.50/mth
Honest Mobile
Unrated service
Uses the Three network
Honest Mobile
Unrated service
Uses the Three network
Get deal*
Via Honest Mobile
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
1mthContract
Monthly cost
£24/mth
Three
Customer service
Three
Customer service
Get deal*
Via Three
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
12mthContract
£60
Automatic cashback
Monthly cost
£29/mth
Equiv cost:Equivalent cost incl cashback: 
£24/mth
Vodafone
Customer service
Vodafone
Customer service
Available from 2 retailers
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
PAYG
Monthly cost
£25/mth
Giffgaff
Customer service
Uses the O2 network
No Wi-Fi calling 
Giffgaff
Customer service
Uses the O2 network
Get deal*
Via Giffgaff
UnltdUnltd
5G data
UnltdUnltd Minutes
UnltdUnltd Texts
PAYG
Monthly cost
£25/mth
Asda
Customer service
Uses the Vodafone network
Asda
Customer service
Uses the Vodafone network
Get deal*
Via Asda
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Unlimited data Sim deals

What is an unlimited data Sim?

With unlimited data Sims you can use as much as you want without having to worry about running out of data. They almost always come with unlimited minutes and texts too.

However, as most people don't tend to actually use much data each month, you can often save by looking at a virtually unlimited 100GB/month Sim instead.

Do note, some networks limit the download speeds of its unlimited Sims. This is known as throttling.

Some unlimited Sims aren't always 'truly unlimited' as networks can apply their own limits which can prevent you from using as much as you might want. This can be done via a number of ways, including capping download speeds, also known as throttling. Another way is to prevent you from tethering, which is why you connect laptop/computer to your phone in order to connect to the internet.

Which networks offer unlimited data Sims?

You'll find unlimited data Sim plans from most of the UK's major networks, including: Vodafone, EE, O2, Three, Tesco Mobile, Smarty, iD Mobile, Giffgaff, Asda Mobile, Superdrug Mobile, Honest Mobile and Lycamobile.

Are there any drawbacks to unlimited data Sims?

As you can imagine, Sims that come with unlimited data are usually more expensive than Sims with a set amount of data. Currently, the cheapest unlimited Sim available costs £11.75 with iD Mobile.

You'd need to weigh up if you actually need unlimited data. In our most recent data usage poll, only 8% of our users reportedly used more than 10GB/month of data, so Sims with unlimited data are for those who really have a need for huge amounts of data.

Can I use my unlimited Sim abroad?

In most cases, you'll be able to use your Sim abroad, but your provider will usually set a limit as to the amount of data you can use as part of its 'fair use policy'. For example, Vodafone is capped at 25GB/month. See our Cheap mobile and data roaming guide for more information.