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30-day SIM deals

Looking for a short-term 30-day SIM only deal? Keep reading to find out everything you need to know about cheap SIM only 30-day mobile phone contracts.

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. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £8.00 a month

    1 month contract

    50 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
  2. Talkmobile SIM deal

    Uses Vodafone's Network

    Talkmobile logo

    £8.00 a month

    1 month contract

    50 GBof 5G data

    • No price rise in 2024
    • EU roaming included
  3. SMARTY SIM deal

    Uses Three's Network

    SMARTY logo

    £7.00 a month

    1 month contract

    33 GBof 5G data

    Uswitch Exclusive
    • No price rise in 2024
    • EU roaming included
    • Best SIM Only Network
  4. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £7.00 a month

    1 month contract

    40 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
  5. spusu Mobile SIM deal

    Uses EE's Network

    spusu Mobile logo

    £7.90 a monthfor 12 months, then £11.90

    1 month contract

    40 GBof 5G data

    Uswitch Exclusive
    • No price rise in 2024
    • EU roaming included
  6. Talkmobile SIM deal

    Uses Vodafone's Network

    Talkmobile logo

    £16.00 a month

    1 month contract

    Unlimited5G data

    • No price rise in 2024
    • EU roaming included
  7. SMARTY SIM deal

    Uses Three's Network

    SMARTY logo

    £16.00 a month

    1 month contract

    Unlimited5G data

    • No price rise in 2024
    • EU roaming included
    • Best SIM Only Network
  8. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £10.00 a month

    1 month contract

    80 GBof 5G data

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

    Uses Vodafone's Network

    Talkmobile logo

    £5.00 a month

    1 month contract

    5 GBof 5G data

    • No price rise in 2024
    • EU roaming included
  10. Talkmobile SIM deal

    Uses Vodafone's Network

    Talkmobile logo

    £7.00 a month

    1 month contract

    25 GBof 5G data

    • No price rise in 2024
    • EU roaming included
  11. Talkmobile SIM deal

    Uses Vodafone's Network

    Talkmobile logo

    £10.00 a month

    1 month contract

    80 GBof 5G data

    • No price rise in 2024
    • EU roaming included
  12. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £16.00 a month

    1 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
  13. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £6.00 a month

    1 month contract

    8 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
  14. Talkmobile SIM deal

    Uses Vodafone's Network

    Talkmobile logo

    £12.00 a month

    1 month contract

    120 GBof 5G data

    • No price rise in 2024
    • EU roaming included
  15. SMARTY SIM deal

    Uses Three's Network

    SMARTY logo

    £12.00 a month

    1 month contract

    120 GBof 5G data

    • No price rise in 2024
    • EU roaming included
    • Best SIM Only Network
  16. Asda Mobile SIM deal

    Uses Vodafone's Network

    Asda Mobile logo

    £5.00 a month

    1 month contract

    3 GBof data

  17. SMARTY SIM deal

    Uses Three's Network

    SMARTY logo

    £6.00 a month

    1 month contract

    6 GBof 5G data

    • No price rise in 2024
    • EU roaming included
    • Best SIM Only Network
  18. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £7.00 a month

    1 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
  19. iD Mobile SIM deal

    Uses Three's Network

    iD Mobile logo

    £12.00 a month

    1 month contract

    100 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. spusu Mobile SIM deal

    Uses EE's Network

    spusu Mobile logo

    £12.90 a month

    1 month contract

    50 GBof 5G data

    • No price rise in 2024
    • EU roaming included
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: 11th July 2024

How does a 30-day SIM work? 

A 30-day or one-month SIM only deal works the same as a 12-month and 24-month SIM only deal – you’re just tied to the contract for a considerably shorter period of time. That means you’re free to ditch the deal at any point with just 30 days’ notice. 

Aside from that, you still get an allowance of data, calls and texts, just as you would with a longer SIM only deal. You don’t have to renew every month, either. The deal will continue to roll until you decide to cancel.

What are the pros and cons of a 30-day SIM deal?

  • Leave the contract at any point with 30-days’ notice

  • Wide range of plans on offer from many networks

  • Minimal credit check, if at all

  • Ideal SIM only stopgap solution

  • You might get more for your money on a longer deal

  • Switching networks for a short time may feel like a bit of a hassle

  • Longer-term SIM plans usually include better benefits

What does a 30-day rolling contract mean?

A 30-day rolling contract is easy to explain – it's simply an agreed payment that lasts 1 month, but you're free to continue using it for as many months as you like on the same terms. It continues to roll on until you decide to stop.

What network providers offer 30-day SIM deals? 

Most UK networks offer one-month SIM only deals, from household names like Vodafone and Three, to smaller providers, like Smarty and iD Mobile.

Vodafone 30-day SIM only deals

Vodafone is one of the UK’s biggest networks, with vast coverage throughout the country. You can grab a 30-day SIM only plan on various data options and some deals also offer inclusive roaming in up to 81 locations.

Three 30-day SIM only deals

Three’s short-term deals cover a range of data plans at attractive prices. Some plans also include tethering and EU roaming. 

giffgaff 30-day SIM only deals

giffgaff offers 30-day 'goody bags', which include different data allowances and even EU-inclusive roaming. giffgaff is powered by O2’s network. 

Virgin Mobile 30-day SIM only deals

Virgin Mobile’s SIM only deals can be purchased on 30-day rolling plans. You can choose from a broad range of data allowances, starting at 4GB per month and going right up to unlimited data.

You’ll get unlimited calls and texts as standard, as well as extras on some plans, such as EU roaming, data rollover and data-free social messaging on sites like WhatsApp and Facebook. 

Smarty 30-day SIM-only deals

Smarty is famed for its low-cost plans and a service that runs on Three’s network. One of Smarty’s attractive features is money off bills in exchange for unused data.  

iD Mobile

Choose an iD Mobile 30-day SIM only deal and you’ll get roaming in 50 locations and a network run on O2’s infrastructure.  

How do I choose the best 30-day SIM deal?

Choosing the best 30-day SIM only deal comes down to your specific needs and requirements. Think about how much data you need, and how much you’re looking to pay. Then compare 30-day offers from UK networks to see which is most suitable for your needs.

What do I do after my 30-day SIM deal finishes?

Once the 30 days of your SIM only deal is up, either continue using and keep the deal rolling or choose another deal to switch to. 

Do I have to top up my 30-day SIM every month?

No, you don’t have to top up a 30-day SIM only plan. The deal will continue on a rolling month-to-month basis until you choose to end it.

How do I cancel my 30-day SIM plan?

Just contact your network and inform them that you no longer wish to continue with the plan, and either choose a new offer from the same network or switch to another provider.

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