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: £20.00
  • Free EU Roaming
  • Free Roaming up to 30GB
  • + More
Unlimited Monthly Data
£13.33 Average Monthly Cost
£15.00 Per Month
Mobiles.co.uk logo. View Deal
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.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • No speed caps
  • Next Day Delivery
  • + More
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month
iD Mobile logo. View Deal
in
Three logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month*
Fonehouse logo. View Deal

*Monthly cost will increase by approx. £1-£1.50 each April
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.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Free EU Roaming
  • iD Mobile App
  • + More
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month
Mobiles.co.uk logo. View Deal
in
Three logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month*
Fonehouse logo. View Deal

*Monthly cost will increase by approx. £1-£1.50 each April
in
iD Mobile logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • 14-day return policy for in-store purchases
  • Unlimited Data
  • + More
Unlimited Monthly Data
£17.00 Average Monthly Cost
£17.00 Per Month
The Carphone Warehouse logo. View Deal
in
Vodafone logo.
24 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Cashback by redemption: £240.00
  • VeryMe Rewards app
  • Flexible Upgrade
  • + More
Unlimited Monthly Data
£17.92 Average Monthly Cost
£25.00 Per Month*
Mobiles.co.uk logo. View Deal

*Monthly cost will increase to £27.50 in April 2026, £30.00 in April 2027
in
iD Mobile logo.
12 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Data Rollover
  • £25 Currys Gift Card Included!
  • + More
Unlimited Monthly Data
£18.00 Average Monthly Cost
£18.00 Per Month
iD Mobile logo. View Deal

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

in
1pMobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
Unlimited Monthly Data
£1.00 Average Monthly Cost
£1.00 Per Month
1pMobile logo. View Deal
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
  • No annual price increase
  • Roaming
  • + 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
  • 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
  • Next Day Delivery
  • Claim up to 3 months Free Apple ftness+, Apple Arcade, Apple Music
  • + More
Unlimited Monthly Data
£15.00 Average Monthly Cost
£15.00 Per Month
iD Mobile logo. View Deal
in
Talkmobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • EU Roaming Included
  • No speed caps
  • + More
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
  • Next Day Delivery
  • Claim up to 3 months Free Apple ftness+, Apple Arcade, Apple Music
  • + 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
  • EU Roaming Included
  • No speed caps
  • + More
Unlimited Monthly Data
£16.95 Average Monthly Cost
£16.95 Per Month
Talkmobile logo. View Deal
in
iD Mobile logo.
1 month contract
, New
  • Unlimited Texts
  • Unlimited Calls
  • Data Rollover
  • No annual price increase
  • + More
Unlimited Monthly Data
£18.00 Average Monthly Cost
£18.00 Per Month
iD Mobile 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

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