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.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £144.00
  • No speed caps
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£10.00 Average Monthly Cost
£16.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £60.00
  • No speed caps
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£10.00 Average Monthly Cost
£15.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £84.00
  • No speed caps
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£10.00 Average Monthly Cost
£17.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £60.00
  • No speed caps
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£13.50 Average Monthly Cost
£16.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £40.00
  • No speed caps
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£13.66 Average Monthly Cost
£17.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • 14-day return policy for online purchases
  • iD Mobile App
  • + More
Unlimited Monthly Data
£14.00 Average Monthly Cost
£16.00 Per Month*
iD Mobile logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
Vodafone logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £138.00
  • eSIM Compatible
  • VeryMe Rewards app
  • + More
Unlimited Monthly Data
£14.50 Average Monthly Cost
£26.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase to £27.80 in Apr 2026
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free Roaming up to 30GB
  • Data Rollover
  • + More
Unlimited Monthly Data
£14.87 Average Monthly Cost
£17.00 Per Month*
iD Mobile logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback paid automatically: £25.00
  • 14-day return policy for online purchases
  • 14-day return policy for in-store purchases
  • + More
Unlimited Monthly Data
£14.91 Average Monthly Cost
£17.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • 14-day return policy for online purchases
  • 14-day return policy for in-store purchases
  • + More
Unlimited Monthly Data
£14.91 Average Monthly Cost
£17.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.

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

in
EE logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • eSIM Compatible
  • 24/7 Service Support
Unlimited Monthly Data
£7.00 Average Monthly Cost
£7.00 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
  • Includes capping + data rollover
  • Prices that stay fixed
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • iD Mobile App
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Includes capping + data rollover
  • Prices that stay fixed
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Data Rollover
  • Next Day Delivery
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month*
iD Mobile logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • iD Mobile App
  • 14-day return policy for online purchases
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month*
The Carphone Warehouse logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
Three logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • £5 monthly discount for using direct debit
  • eSIM Compatible
  • + More
Unlimited Monthly Data
£15.50 Average Monthly Cost
£31.00 Per Month*
Three logo. View Deal

*Monthly cost will increase by approx. £1-£1.50 each April
in
Talkmobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • Free EU Roaming
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
Talkmobile logo. View Deal
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Data Rollover
  • Next Day Delivery
  • + More
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month*
iD Mobile logo. View Deal

*Monthly cost will increase by £1.50 each April.
in
Talkmobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • Free EU Roaming
Unlimited Monthly Data
£16.00 Average Monthly Cost
£16.00 Per Month
Talkmobile logo. View Deal

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