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Compare 12-month SIM only deals

Sign up for a 12-month SIM only deal and you’ll get all the data, minutes, and texts you need without having to top up credit or pay for a new mobile phone.

Uswitch tips

How do I switch and keep my number?
Thumbnail, graphic - SIM cards from different networks. Uswitch compares deals from Lebara Mobile, O2, iD Mobile, Three, Vodafone and others.

1. Choose your new deal
Select a deal below and click through to the network’s site.

2. Get your PAC code
You’ll need a special code to keep your number when you switch. It's quick and free:
Text PAC to 65075 to receive your code.

3. Give the code to your new network
Contact the new network after signing up to provide them with your PAC code, which will begin the process and will automatically cancel your previous plan. Alternatively, you can enter the PAC code when signing up on the network’s site.

List of SIM Only deals

Sorted by: Uswitch Promoted

  1. O2 SIM deal

    O2 logo

    £10.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    50 GBof 5G data

    • Best Network for Roaming
    • EU roaming included
    • 3 months Free Disney+
    • Best Network for Roaming
  2. O2 SIM deal

    O2 logo

    £7.99 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    15 GBof 5G data

    • EU roaming included
    • O2 Priority Tickets
    • Best Network for Roaming
  3. O2 SIM deal

    O2 logo

    £6.99 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    6 GBof 5G data

    • EU roaming included
    • O2 Priority Tickets
    • Best Network for Roaming
  4. Vodafone SIM deal

    Vodafone logo

    £8.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    30 GBof data

    • VeryMe Rewards app
  5. O2 SIM deal

    O2 logo

    £15.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    100 GBof 5G data

    • EU roaming included
    • 3 months Free Disney+
    • Best Network for Roaming
  6. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £6.00 a month

    12 month contract

    25 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  7. Three Mobile SIM deal

    Three Mobile logo

    £8.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    30 GBof 5G data

    • Three+ rewards app
  8. Three Mobile SIM deal

    Three Mobile logo

    £12.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    120 GBof 5G data

    • Three+ rewards app
  9. O2 SIM deal

    O2 logo

    £18.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    250 GBof 5G data

    • EU roaming included
    • 3 months Free Disney+
    • Best Network for Roaming
  10. Vodafone SIM deal

    Vodafone logo

    £10.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    50 GBof data

    • VeryMe Rewards app
  11. O2 SIM deal

    O2 logo

    £9.99 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    30 GBof 5G data

    • EU roaming included
    • O2 Priority Tickets
    • Best Network for Roaming
  12. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £10.00 a month

    12 month contract

    120 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  13. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £16.00 a month

    12 month contract

    Unlimited5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  14. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £9.00 a month

    12 month contract

    70 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  15. Vodafone SIM deal

    Vodafone logo

    £7.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    6 GBof data

    • VeryMe Rewards app
  16. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £7.00 a month

    12 month contract

    30 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  17. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £8.00 a month

    12 month contract

    45 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  18. Three Mobile SIM deal

    Three Mobile logo

    £21.00 a monthMonthly cost will rise every April by inflation (CPI) plus 3.9%.

    12 month contract

    Unlimited5G data

    • Three+ rewards app
  19. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £12.00 a month

    12 month contract

    250 GBof 5G data

    • No price rise in 2024
    • Claim 3 months free Apple Music and Arcade
    • Free roaming up to 30GB
    • Best Network for Data
  20. Honest Mobile SIM deal

    Uses Three's Network

    Honest Mobile logo

    £11.25 a month for 3 months, then £22.50

    12 month contract

    Unlimited5G data

    Uswitch Exclusive
    • No price rise in 2024
Can't find what you're looking for?

Uswitch services are provided at no cost to you, but we may receive a commission from the companies we refer you to. If a deal is "promoted" on Uswitch's tables, then it has been lent additional visibility as a result of us securing exclusivity on a great deal, or a commercial agreement to showcase what we believe to be market-leading value to consumers. Learn more about how our site works.

Please note: Mobile networks may increase monthly prices in line with the retail or consumer price index each year during the length of your contract. Please refer to individual network's terms and conditions before signing up.

Author: Ray Ali | Last updated: 19 April 2024

What is a 12-month SIM only contract?

A 12-month SIM only contract is a year-long SIM only mobile phone plan. In your contract, you will get a specific amount of minutes, data and texts each month for a set monthly fee. You won’t get a mobile phone included as part of this deal, so you’ll need to use a phone you currently have or buy a new one outright. 

What are the benefits of 12-month contracts?

Smartphones are expensive, and paying off the cost of one in a pay monthly plan can mean big monthly bills, especially if you get a new model like an iPhone 14 or a Samsung Galaxy S22.

But if you’re not bothered about getting the hottest new device and already have a mobile phone you’re happy to use for the foreseeable future, a 12-month SIM only plan is an ideal way to reduce your monthly outgoings. 

  • That’s because with a SIM only plan you only pay for your data, calls and text allowance, there’s no pricey smartphone to pay off. 

  • And unlike pay as you go, you don’t have to go through the hassle of topping up your phone credit. 

  • Convenient and budget-friendly, a 12-month SIM only deal could be the perfect way to get the most out of your smartphone.

How to choose the best 12-month contract SIM only deal for you?

While it’s shorter than a typical two-year contract, a 12-month SIM only deal is still a long-term financial commitment. It’s important you choose a deal you’re completely happy with, that includes the right amount of data, calls, and texts – as well as any extras you may be interested in.

Data 

You may think getting the most data possible is the best bet. But have you considered how much you actually need? It’s easy to be drawn in by big data deals, but if you get way more than you use, you’ll end up overpaying. 

It’s best to think about what you primarily use your mobile phone for. If you’re big on streaming shows and music, you should probably opt for a high-data or unlimited-data deal. 

But if you’re just into casual surfing and browsing socials, you likely won't need more than 10GB at the most. 

If you only use your smartphone for the odd email or instant message, you may need even less, like 5GB. 

Extras 

Networks often include added incentives, like discounts on streaming services and priority access to concert and event tickets. You may also get access to TV channels, like TNT Sports (formerly BT Sport), included in your plan. Keep an eye out for extras when you’re shopping around for the ideal 12-month SIM only deal.

What network providers offer 12-month contract SIM only deals?

You can get a 12-month SIM only deal on major UK networks, including Three, O2, Vodafone, and Tesco Mobile.

Here’s a quick overview of what the networks offer:

Three

Three offers SIM-only deals on 12-month contracts (as well as 1-month and 24-month). You can choose from plenty of data options as well as benefits and extras. 

O2

O2 is one of the UK’s biggest networks, so you can expect to find a wide range of 12-month SIM-only deals at various price points.

O2’s extras include its priority service which gets you early access to concert and event tickets. 

Vodafone

Vodafone offers Red Entertainment and international roaming on some of its 12-month SIM only deals. You also get connected to one of the UK’s best mobile infrastructures with coverage all around the nation. 

Tesco Mobile

Tesco Mobile is an excellent option for people on a budget, as it offers 12-month SIM only deals at attractive price points. You can even get Tesco Clubcard points as part of the plans. 

What happens at the end of a 12-month sim-only contract? 

When you reach the end of a SIM only 12-month plan on a UK network like Vodafone, Three, O2, EE or most of the other providers, you’ll usually continue rolling on the previously agreed terms until you switch to a new plan or a new network. 

Can I keep my number when I get a new SIM?

Yes, you can keep your current phone. And it’s really easy to do. All you need is your PAC code, which you can easily get by texting PAC to 65075. Then, give your PAC code to your new network and they’ll be able to transfer over your existing number. 

You can get a range of different SIM only deals, from 30-day rolling contracts to longer 24-month contracts, with all sorts of data packages across the board. 

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