Cheapest Unlimited Data SIM Deals UK | PAYM And PAYG

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

in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £55.00
  • Wi-Fi Calling
  • Free Roaming up to 30GB
  • + More
Unlimited Monthly Data
£11.42 Average Monthly Cost
£16.00 Per Month
Mobiles.co.uk logo. View Deal
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £40.00
  • Data Rollover
  • Prices that stay fixed
  • + More
Unlimited Monthly Data
£11.67 Average Monthly Cost
£15.00 Per Month
The Carphone Warehouse logo. View Deal
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £36.00
  • Wi-Fi Calling
  • Free Roaming up to 30GB
  • + More
Unlimited Monthly Data
£12.00 Average Monthly Cost
£15.00 Per Month
Mobiles.co.uk logo. View Deal
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free EU Roaming
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£8.00 Per Month*
iD Mobile logo. View Deal

*Price increases to £16.00 after 3 months
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £50.00
  • Wi-Fi Calling
  • Free Roaming up to 30GB
  • + More
Unlimited Monthly Data
£14.92 Average Monthly Cost
£17.00 Per Month
Mobiles.co.uk logo. View Deal
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • Unlimited Data
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
The Carphone Warehouse logo. View Deal
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free Roaming up to 30GB
  • iD Mobile App
  • + More
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
iD Mobile logo. View Deal
in
Vodafone logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £216.00
  • Wi-Fi Calling
  • Flexible Upgrade
  • + More
Unlimited Monthly Data
£16.25 Average Monthly Cost
£24.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase to £26.50 in April 2027, £29.00 in April 2028
in
Three logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month*
Metrofone logo. View Deal

*Monthly cost will increase by approx. £1-£1.50 each April
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free EU Roaming
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month
iD Mobile logo. View Deal

Cheapest pay as you go (month to month) unlimited data SIM deals

in
EE logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • 24/7 Service Support
  • Wi-Fi Calling
  • + More
Unlimited Monthly Data
£9.00 Average Monthly Cost
£9.00 Per Month*
EE logo. View Deal

*Monthly cost will increase by approx. £1.50 each April
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • Unlimited Data
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
The Carphone Warehouse logo. View Deal
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free EU Roaming
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
iD Mobile logo. View Deal
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Wi-Fi Calling
  • Free Roaming up to 30GB
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
Mobiles.co.uk logo. View Deal
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free EU Roaming
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
iD Mobile logo. View Deal
in
Talkmobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • No annual price increase
  • + More
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
Talkmobile logo. View Deal
in
Smarty logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£18.00 Average Monthly Cost
£18.00 Per Month
Smarty logo. View Deal
in
Lebara logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
Lebara logo. View Deal
in
1pMobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
1pMobile logo. View Deal
in
1pMobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£25.00 Average Monthly Cost
£25.00 Per Month
1pMobile logo. View Deal

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