iD Mobile's best SIM only offers: 25GB for £6, 108GB for £9
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We look at how iD compare on price this month against their competitors on SIM only and find their best offers. Last updated: 9th September 2026.
iD Mobile's best SIM only deals
The best SIM only deal on iD Mobile this month
just
£6
a month
✔ Unlimited mins and 25GB data See full deal
at idmobile.co.uk
(opens in new window)
We think the best value for money SIM only plan on iD Mobile for September is their discounted 25GB for £6 deal. It's on a 1‑month plan and comes with unlimited minutes and texts too:
There are currently no other SIM only deals with 25GB data or more on other networks that can beat iD's plan here. Here are other providers' closest efforts anyway:
Their £9 for 108GB plan is a decent deal for September
just
£9
a month
✔ Unlimited mins and 108GB data See full deal
at idmobile.co.uk
(opens in new window)
To get a bigger chunk of data, you might like the discounted £10 £9 SIM only deal running on iD Mobile at the moment. It's a 1‑month plan, which comes with 108GB data, unlimited minutes and texts too:
That £1 monthly saving vs full price will save you £12 in total over the course of a year.
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:
They're also offering 50GB for £7 on SIM only currently
just
£7
a month
✔ Unlimited mins and 50GB data See full deal
at idmobile.co.uk
(opens in new window)
For less monthly 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 50GB data, unlimited minutes and texts for £7 a month:
Compare this with similar deals from other networks with 50GB data or more 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