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: 15th September 2026.
iD Mobile's best SIM only deals
The best value 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)
Out of all the SIM only plans available this September on iD Mobile, we'd say their best value deal is their discounted 1‑month SIM below, which gets you 25GB data, plus unlimited minutes and texts for £6 a month:
Compare this with similar deals from other networks with 25GB 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:
£9 for 108GB is iD's next best SIM deal in September
just
£9
a month
✔ Unlimited mins and 108GB data See full deal
at idmobile.co.uk
(opens in new window)
For more monthly data, have a look at iD Mobile's discounted 108GB SIM below at £10 £9 a month, as it's another good deal. It's on a 1‑month plan and comes with 108GB data, unlimited minutes and texts:
That discount will save you £1 a month, which would add up to £12 over the course of a year.
It's certainly a good deal from iD. No other network can beat them for price on a SIM only plan with 108GB data or more. See under the dropdown to see how the competition it undercuts:
There's also a nice 50GB for £7 plan with them this month
just
£7
a month
✔ Unlimited mins and 50GB data See full deal
at idmobile.co.uk
(opens in new window)
For a smaller amount of data, another option for you on iD is their discounted 1‑month SIM below, which costs £7 a month for 50GB data and comes with unlimited minutes and texts:
There's not currently a better SIM only deal on the market than iD's one above if you want 50GB data or more. Here's the closest their competitors get for similar plans:
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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