iD Mobile SIM only offers: 20GB for £6, 40GB for £7
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We've checked through all the SIM only plans available on iD this month to find which stack up best against the competition. Last updated: 6th January 2026.
iD Mobile's best SIM only deals
The best overall iD Mobile SIM only deal this month
just
£6
a month
✔ Unlimited mins and 20GB data See full deal
at idmobile.co.uk
(opens in new window)
Looking at all iD Mobile's options on SIM only this January, the deal that jumps out to us is their discounted 20GB for £6 one below. It's a 1‑month plan and comes with unlimited minutes and texts too:
iD have actually got the best price in the UK at the moment for a SIM only deal 20GB data or more. If you want to see the plans other networks this beats, use the dropdown below:
They're also offering 40GB for £7 on SIM only currently
just
£7
a month
✔ Unlimited mins and 40GB data See full deal
at idmobile.co.uk
(opens in new window)
If you need more data, we'd say this is one of iD's best deals on SIM only this month too. It's a discounted 1‑month plan, comes with 40GB data, unlimited minutes and texts for £7 a month:
That's actually the best price for a SIM only deal with 40GB data or more in the UK at the moment - so credit to iD. Use the dropdown below to see other networks' closest plans:
£8 for 60GB is iD's next best SIM deal in January
just
£8
a month
✔ Unlimited mins and 60GB data See full deal
at idmobile.co.uk
(opens in new window)
For even more monthly data, have a look at iD Mobile's discounted 60GB SIM below at £8 a month, as it's another good deal. It's on a 1‑month plan and comes with 60GB data, unlimited minutes and texts:
There are currently no other SIM only deals with 60GB data or more on other networks that can beat iD's plan here. Here are other providers' closest efforts anyway:
There's also a nice 108GB for £9 plan with them this month
just
£9
a month
✔ Unlimited mins and 108GB data See full deal
at idmobile.co.uk
(opens in new window)
To get even more data, another option for you on iD is their discounted 1‑month SIM below, which costs £10 £9 a month for 108GB data and comes with unlimited minutes and texts:
That’s £12 you’d save over a year on the same deal, thanks to the £1 monthly discount.
This is actually the leading price in the UK at the moment for a SIM only deal with 108GB data or more. The plans under the dropdown are the next nearest you can get to iD with other providers:
£40 Clubcard voucher (you must claim this reward)Or their £15 for unlimited data SIM plan is worth a look too
just
£15
a month
✔ Unlimited mins and unlimited data See full deal
at idmobile.co.uk
(opens in new window)
For people who need even more data, iD have got a discounted £18 £15 deal on SIM only we think's worth looking at. It gets you unlimited data, unlimited minutes and texts and it's a 1‑month plan:
That means a total saving of £36 if you added up that £3 monthly discount over a whole year.
Compare this with similar deals from other networks with unlimited data and you'll find iD's actually comes out best on price. Have a look at the nearest other providers get for comparable SIM only deals:
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How iD Mobile's deals compare with other networks
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How iD’s benefits and SIM only prices stack up
In our review of iD Mobile, we said we liked that they offered full access to Three’s network (including identical 5G speeds and coverage) on low-cost deals. And they have an excellent WiFi calling scheme as well.
You can choose either a 1-month, 12-month or 24-month contract on iD. It tends to be the case that longer contracts cost you less per month. But it’s still worth checking to see what their best current deals are.
iD tend to offer great value on all their SIM only plans, and the cost of your plan won’t increase during your contract so you can hold onto that value. They’re usually one of the cheapest ways onto Three’s network.
They’re fairly low-frills, but they do have a good data rollover scheme that lets you keep unused data for your next month. They also offer inclusive EU roaming. But they don’t offer much else.
Useful link: Read our full iD Mobile review
What else you should know about iD’s SIM only plans
Your iD Mobile SIM card will be delivered within 2-3 working days after ordering. You’ll get each size of SIM card in your package to fit any phone. iD don’t offer eSIMs yet (see the providers that do here).
When you order anything online you have 14 days to get a full refund, and this is also the case for SIM cards. Here’s how you can get a refund if you’re unhappy with your SIM.
You’ll have to pass a credit check to join iD, no matter if you want to join on a 1-month, 12-month or 24-month contract. If you’ve been rejected for a contract you can still join on a PAYG monthly bundle.
If you’re switching from one network to get onto iD Mobile then you can keep your number by requesting a PAC from your current provider to give to iD. Here’s more info on how to do that.
Useful link: Compare all iD SIMs