Best SIM deals on iD Mobile: 25GB for £6, 50GB for £7
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We've compared pricing on all of iD's pay monthly SIM only to find which ones stack up best against the rest of the market. Last updated: 21st October 2026.
iD Mobile's best SIM only deals
Our favourite SIM only deal this month on iD Mobile
just
£6
a month
✔ Unlimited mins and 25GB data See full deal
at idmobile.co.uk
(opens in new window)
We think iD Mobile's best value option on SIM only this October is their discounted £6 a month plan below, which comes with 25GB data, plus unlimited minutes and texts on a 1‑month deal:
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:
Their £7 for 50GB plan is a decent deal for October
just
£7
a month
✔ Unlimited mins and 50GB data See full deal
at idmobile.co.uk
(opens in new window)
For people who need more data, iD Mobile are also offering this discounted £7 SIM, which includes 50GB data, unlimited minutes and texts on a 1‑month plan. It's another of their best deals:
It's currently the best priced 50GB data or more SIM only deal on a provider using the Three network, even if you can beat it on price if you're open to ones not on Three. Here are other networks you can beat it on:
They're also offering 60GB for £8 on SIM only currently
just
£8
a month
✔ Unlimited mins and 60GB data See full deal
at idmobile.co.uk
(opens in new window)
If you want even more data, you might like the discounted £8 SIM only deal running on iD Mobile at the moment. It's a 1‑month plan, which comes with 60GB data, unlimited minutes and texts too:
It's a good enough deal to get into iD's best SIMs but you can actually get a lower price for a similar plan elsewhere, even if you definitely want it to use the Three network. See the networks with cheaper plans here:
£9 for 108GB is iD's next best SIM deal in October
just
£9
a month
✔ Unlimited mins and 108GB data See full deal
at idmobile.co.uk
(opens in new window)
For even 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 108GB data, unlimited minutes and texts for £10 £9 a month:
Getting £1 off a month means you’ll save £12 in total, if you spend a whole year on the deal.
It might not be the lowest-cost SIM only deal with 108GB data or more on the entire market but if you're sure you need a SIM using the Three network, it is the best-priced. Here's which other networks can beat it:
There's also a nice unlimited data for £15 plan with them this month
just
£15
a month
✔ Unlimited mins and unlimited data See full deal
at idmobile.co.uk
(opens in new window)
If you're even more data-hungry, have a look at iD Mobile's discounted unlimited data SIM below at £18 £15 a month, as it's another good deal. It's on a 1‑month plan and comes with unlimited data, unlimited minutes and texts:
With £3 off per month, the total saving if you spent a year on the deal adds up to £36.
You can't actually currently beat iD's prices there for a SIM only deal with unlimited data on any other provider. Here are the closest alternatives each network is currently offering:
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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