iD Mobile's best SIM only deals: 20GB for £6, 40GB for £7
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We've looked at SIM only on all UK networks to help you find out which of iD's plans work out best, for every data requirement. Last updated: 21st November 2025.
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)
We think iD Mobile's best value option on SIM only this November is their discounted £6 a month plan below, which comes with 20GB data, plus unlimited minutes and texts on a 1‑month deal:
Compare this with similar deals from other networks with 20GB 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:
iD's 40GB for £7 plan is a good option too
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, the next best SIM only plan on iD Mobile in our opinion is their discounted 1‑month one below. For £7 a month, you get 40GB data, plus unlimited minutes and texts:
It's certainly a good deal from iD. No other network can beat them for price on a SIM only plan with 40GB data or more. See under the dropdown to see how the competition it undercuts:
Their £8 for 60GB plan is a decent deal for November
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, another good deal on iD Mobile at the moment is their discounted £8 SIM only plan here, which includes 60GB data instead, plus unlimited minutes and texts:
There's not currently a better SIM only deal on the market than iD's one above if you want 60GB data or more. Here's the closest their competitors get for similar plans:
They're also offering 108GB for £9 on SIM only currently
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, our next best pick of iD Mobile SIM only plans is their discounted 1‑month £10 £9 deal below, which gets you 108GB data and unlimited minutes and texts:
That’s £12 you’d save over a year on the same deal, thanks to the £1 monthly discount.
iD's is actually the best-priced SIM only deal in the UK at the moment for 108GB data or more. No other providers can beat it for monthly cost. Here's each network's nearest plan:
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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