SIM only · no contract
30-day SIM only deals
Rolling SIM only plans you can change or cancel every month. We show each network’s cheapest 30-day plan with 10GB or more.
bemobiles tips
Are 30-day SIMs more expensive?
Often only slightly — and you can move to a better deal any month.
Do 30-day plans have price rises?
Some networks still apply an April rise, but you can simply leave before it.
Do I keep my number?
Yes. Text PAC to 65075 and give the code to your new network.
No price rise- Runs on Three
- 30-day rolling plan
- No credit check
- EU roaming included, 12 GB
£6 a month
Get this dealSMARTY review →Live price, checked several times a day.
30-day SIM only: every network ranked
| # | Network | Data | Contract | Monthly | Masts | 24 months, rises included | |
|---|---|---|---|---|---|---|---|
| 1 |  Talkmobile | 20GB | 30 days | £5.95 | Vodafone (plus Three) | £142.80 | Get deal |
| 2 | SMARTY | 18GB | 30 days | £6 | Three | £144 | Get deal |
| 3 |  iD Mobile | 25GB | 30 days | £6 | Three | £144 | Get deal |
| 4 |  Lebara | 15GB | 30 days | £7 | Vodafone | £168 | Get deal |
| 5 |  Asda Mobile | 10GB | 30 days | £8 | Vodafone | £192 | Get deal |
| 6 |  O2 | 10GB | 30 days | £7 | Own network | £228 | Get deal |
| 7 |  giffgaff | 20GB | 30 days | £10 | O2 | £240 | Get deal |
| 8 |  Lycamobile | 30GB | 30 days | £10 | EE | £240 | Get deal |
| 9 |  VOXI | 80GB | 30 days | £10 | Vodafone | £240 | Get deal |
| 10 |  Tesco Mobile | 50GB | 30 days | £10 | O2 | £254.40 | Get deal |
| 11 |  Three | 60GB | 30 days | £10 | Own network | £285.60 | Get deal |
| 12 |  Sky Mobile | 25GB | 30 days | £15 | O2 | £360 | Get deal |
| 13 |  Vodafone | 15GB | 30 days | £25 | Own network | £660 | Get deal |
Cheapest plan per network matching this page, checked 27 October 2026. “24 months” adds each network’s April rise for a plan starting this month; on 30-day plans you can leave before a rise.
Why a 30-day SIM is usually the smart choice
A 12- or 24-month SIM only contract saves little and locks you in. A 30-day plan lets you follow the price: when a network cuts prices or adds data, you move. If your phone is paid off, it is the cheapest way to stay connected.
The table compares each network’s cheapest 30-day plan with at least 10GB. Many of the budget networks run on the same masts as the big four, so coverage is the same.
All matching deals, live
FAQ
Common questions
Can I cancel a 30-day SIM any time?
Yes — give 30 days’ notice, or simply switch with a PAC code and the old plan ends.
Is a 30-day SIM good for a new phone?
Yes. Buying a phone outright and adding a 30-day SIM is often cheaper than a contract — see our calculator.
Do 30-day SIMs need a credit check?
Not on giffgaff, SMARTY, Lebara or VOXI. The big networks usually run one.