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Compare SIM only deals from leading UK networks. Unlimited data, 30-day rolling, 5G, PAYG, family SIMs and data-only plans. All in one place.
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Most popular
SIM only deals
All plans compared. 30-day and 12-month options from leading UK networks.
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Best value
Unlimited data SIMs
Never run out. Compare unlimited SIM plans from Three, Smarty, Vodafone and more.
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5G ready
5G SIM only
Get 5G speeds on a SIM only plan. EE, Vodafone, Three and more.
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No tie-in
No contract SIMs
30-day rolling plans. Cancel or change anytime, no exit fee.
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No monthly fee
Pay as you go
Top up when you need it. Ideal for light or occasional users.
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Tablets & devices
Data only SIMs
Data without calls or texts. For tablets, laptops, routers, and connected devices.
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Multi-SIM
Family SIM deals
Multiple SIMs on one account. Save more when everyone switches together.
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Students
Student SIMs
Flexible, affordable plans for students. No long contracts required.
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Wearables
Apple Watch SIMs
Standalone data plans for Apple Watch and other connected wearables.
Compare nowIf your phone is paid off or you own your handset outright, there is almost no reason to stay on a phone contract. SIM only plans give you exactly the same calls, texts, and data for significantly less money. The average person switching from a rolling contract to SIM only saves around £20 per month. that is £240 a year for doing nothing except swapping a SIM card. The networks do not advertise this fact particularly loudly, for obvious reasons.
SIM only vs phone contract: the real numbers
| Data allowance | Typical contract | SIM only equivalent | Monthly saving |
|---|---|---|---|
| 5GB | £25 to £35/month | £5 to £8/month | £17 to £27 |
| Unlimited | £40 to £55/month | £15 to £25/month | £20 to £35 |
| Unlimited + 5G | £45 to £60/month | £18 to £30/month | £20 to £35 |
The saving is largest on unlimited data plans. A typical unlimited contract runs £40 to £55 per month. An equivalent SIM only unlimited plan from Three or Smarty costs £15 to £25 per month on a 30-day rolling basis. no contract needed.
Which network is right for you?
Every major UK network offers SIM only plans but they differ on price, coverage, and what they are best at. Here is the honest summary.
Three
Smarty
giffgaff
Lebara
EE
Vodafone
Networks like Smarty, giffgaff, Lebara, and ID Mobile are MVNOs. they run on the infrastructure of the big four networks but charge significantly less. If you have good coverage from O2, Three, EE, or Vodafone in your area, an MVNO on that network will give you the same signal for less money.
Questions about SIM only deals
A SIM only deal gives you a SIM card with calls, texts, and data but no handset. You put it in a phone you already own. SIM only plans are significantly cheaper than phone contracts because you are not paying off a handset. They come on 30-day rolling, 12-month, and 24-month terms from all major UK networks.
Yes for most people. If your phone is paid off, switching to SIM only typically saves £15 to £30 per month for the same data. Over a year that is £180 to £360 saved. The only reason to stay on a contract is if you want a new handset and want to spread the cost.
Yes. Text PAC to 65075 and your current network must send your PAC code within two minutes. Give it to your new network when you sign up and your number transfers within one working day. You will not lose your number during the switch.
30-day plans cost slightly more per month but let you cancel or change anytime. 12-month plans lock you in but offer a lower monthly price. If you are confident in your usage and network choice, 12 months offers better value. If you want flexibility, the small premium on a 30-day plan is worth it.
If your phone is unlocked it will work on any UK network. Phones bought outright are usually unlocked. Phones bought on contract may be locked. contact your current provider to unlock it for free once your contract has ended. iPhones bought directly from Apple are always unlocked.
Related guides
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