Searching for the cheapest possible unlimited data SIM you can buy in the UK?
Below, you’ll find the cheapest SIM deals with unlimited usage on the market at the moment.
Contents
- Cheapest pay monthly unlimited data SIM deals
- Cheapest pay as you go (month to month) unlimited data SIM deals
Cheapest pay monthly unlimited data SIM deals
12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Cashback by redemption: £96.00
- Recommend a Friend and Earn Rewards
- Data Rollover
- + More
Unlimited Monthly Data
£9.00 Average Monthly Cost
£17.00 Per Month
View Deal 12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Cashback paid automatically: £34.00
- Recommend a Friend and Earn Rewards
- Data Rollover
- + More
Unlimited Monthly Data
£12.17 Average Monthly Cost
£15.00 Per Month
View Deal 12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Capped Contracts
- Data Rollover
- + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£8.00 Per Month*
View Deal*Price increases to £16.00 after 3 months
12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Recommend a Friend and Earn Rewards
- Data Rollover
- + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£14.00 Per Month
View Deal 12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Data Rollover
- Free EU Roaming
- + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£14.00 Per Month
View Deal
18 month contract
, New
- Unlimited Texts
- Unlimited Calls
- eSIM Available
- Become a Super Recruiter and earn rewards
- Bring a mate, earn £5
- + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£14.00 Per Month
View Deal 12 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Data Rollover
- Free EU Roaming
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal 24 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Data Rollover
- Free EU Roaming
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal 24 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Capped Contracts
- Data Rollover
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal 24 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Recommend a Friend and Earn Rewards
- Data Rollover
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View DealCheapest pay as you go (month to month) unlimited data SIM deals
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
- eSIM Available
- 24/7 Service Support
- Wi-Fi Calling
Unlimited Monthly Data
£9.00 Average Monthly Cost
£9.00 Per Month*
View Deal*Monthly cost will increase by approx. £1.50 each April
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Capped Contracts
- Data Rollover
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal 1 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Data Rollover
- Free EU Roaming
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal 1 month contract
, New
- Unlimited Texts
- Unlimited Calls
- Recommend a Friend and Earn Rewards
- Data Rollover
- + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
View Deal
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
- eSIM Available
- No speed caps
- No annual price increase
- + More
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
View Deal
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month
View Deal
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
View Deal
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
View Deal 1 month contract
, New
- Unlimited Texts
- Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
View Deal
1 month contract
, New
- Unlimited Texts
- Unlimited Calls
Unlimited Monthly Data
£30.00 Average Monthly Cost
£30.00 Per Month
View DealAbout the author
Tom is the founder of Green Smartphones. You’ll find him writing about phones on the Green Smartphones blog, or talking about SIM deals and mobile networks on our YouTube channel. He’s the Android expert on the team – currently using a Google Pixel 9, recently upgrading from a very long-suffering Note 20 Ultra. When he’s not working on Green Smartphones, you’ll find him playing football or hiking.