In this guide
- How does a 30-day rolling SIM contract work?
- 30-day rolling vs 12-month SIM-only contracts
- Can my price go up on a 30-day rolling plan?
- How do I cancel a 30-day rolling SIM contract?
- Which networks offer 30-day rolling SIM plans?
- FAQs
- Do I need a credit check for a 30-day rolling plan?
- Can I use a 30-day SIM in any phone?
- What happens if I do not cancel at the end of the month?
- Is a 30-day rolling plan the same as pay as you go?
- Editorial policy
A one month rolling SIM contract is a SIM-only plan that renews automatically every 30 days. You pay for one month at a time and can cancel or switch at any point without paying an exit fee. There is no minimum term beyond the current billing period.
Reviewed by Phil Brown, founder of SIM Only Finder. Before launching SIM Only Finder, Phil worked in UK mobile retail at Three UK, advising customers on SIM plans, contracts, and network choices. He has spent over a decade running consumer comparison platforms. About the author
Last reviewed: March 2026.
How does a 30-day rolling SIM contract work?
When you sign up for a 30-day rolling plan, you pay upfront for your first month. Your plan then renews automatically each month on the same date unless you cancel. Your allowance of calls, texts, and data resets at the start of each new billing period.
Because you are paying month by month, most 30-day rolling plans do not require a credit check. You are not committing to a long-term agreement, so the risk to the network is lower and the sign-up process is typically straightforward.
You can compare current 30-day SIM-only deals on our deals page, where results are sorted by monthly cost and can be filtered by data allowance.
30-day rolling vs 12-month SIM-only contracts
The main difference is flexibility versus price. A 30-day rolling plan gives you the freedom to leave or change your plan at any time. A 12-month contract locks in a price for a year and sometimes offers a slightly lower monthly cost in return for that commitment.
On a 12-month contract, leaving early will usually incur an exit fee covering the remaining months. On a 30-day plan, you can leave at the end of any billing period with no charge.
A 30-day plan is the better choice if you are not sure how much data you need, if you expect your circumstances to change, or if you want the flexibility to switch to a better deal as soon as one becomes available. A 12-month contract may make sense if you have found a plan you are happy with and the monthly saving is worth the reduced flexibility.
Can my price go up on a 30-day rolling plan?
Yes, your provider can raise the price on a 30-day plan. However, you are free to leave at the end of your current billing period if you are not happy with the new price, with no exit fees. This makes 30-day plans much lower risk than longer contracts when it comes to price rises.
Several networks offering 30-day plans have also committed to no annual price rises at all, including spusu, Smarty, and Lycamobile. For a full breakdown, see our guide to SIM-only mid-contract price rises.
How do I cancel a 30-day rolling SIM contract?
To cancel, you either request a PAC code (if you want to keep your number and move to a new network) or a STAC code (if you want to leave without transferring your number). Text PAC or STAC to 65075 and you will receive your code within 60 seconds, free of charge.
If you are using your PAC code to switch to a new network, give the code to your new provider when you sign up. Your number will transfer automatically, usually within one working day, and your old plan cancels automatically at the same time.
If you simply want to cancel without switching, contact your network directly. Your plan will end at the close of your current billing period.
Which networks offer 30-day rolling SIM plans?
Most UK networks offer at least some 30-day rolling options. Networks that offer only 30-day rolling plans with no longer contracts include spusu, Smarty, Voxi, and ParentShield. Networks such as iD Mobile, Giffgaff, and Lycamobile offer both 30-day and longer contract options.
You can filter by contract length on our 30-day SIM-only deals page to see all current options.
FAQs
Do I need a credit check for a 30-day rolling plan?
Most 30-day rolling plans do not require a credit check, as you pay upfront each month rather than entering a credit agreement. Some networks state this explicitly. If avoiding a credit check is important to you, see our no credit check SIM-only deals page.
Can I use a 30-day SIM in any phone?
Yes, as long as your phone is unlocked. Phones sold in the UK after December 2021 must be sold unlocked by law. If you have an older phone that is locked to a network, contact that network to request a free unlock before switching.
What happens if I do not cancel at the end of the month?
Your plan renews automatically and you are charged for another month. If you want to leave, you need to request your PAC or STAC code and either switch or cancel before your next renewal date.
Is a 30-day rolling plan the same as pay as you go?
No. A 30-day rolling plan gives you a fixed monthly allowance of calls, texts, and data for a set monthly price that renews automatically. Pay as you go means you top up credit and pay per call, text, or data used, with no monthly commitment.
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