iD Mobile's best SIM only deals: 15GB for £6, 50GB for £8
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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: 12th November 2025.
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 15GB data See full deal
at idmobile.co.uk
(opens in new window)
From all the options iD Mobile have got available this November on SIM only, we think this discounted £6 1‑month deal is their best. For your £6 a month, you get 15GB data alongside unlimited minutes and texts:
You can get a lower-priced SIM with 15GB data or more elsewhere if you don't need it to use the Three network. But if you do need that, it is the cheapest deal available. See lower-priced networks' deals here:
We also like their £8 for 50GB plan
just
£8
a month
✔ Unlimited mins and 50GB data See full deal
at idmobile.co.uk
(opens in new window)
To get a bigger data allowance, we also think this discounted £8 iD Mobile SIM is one of their best options. It comes with 50GB data, unlimited minutes and texts on a 1‑month deal:
It's definitely one of iD's best. But it's not market-leading. You can get a similar plan on other providers for less, even if you need your SIM to use the Three network. Here are other networks you can beat it on:
Their 108GB for £9 SIM is another good option
just
£9
a month
✔ Unlimited mins and 108GB data See full deal
at idmobile.co.uk
(opens in new window)
To get an even bigger chunk of data, iD's discounted £10 £9 SIM below is another of their best deals this month. For £9 a month, it offers 108GB data, unlimited minutes and texts on a 1‑month plan:
That £1 monthly saving vs full price will save you £12 in total over the course of a year.
Compare this with similar deals from other networks with 108GB 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 unlimited data for £16 plan is a good option too
just
£16
a month
✔ Unlimited mins and unlimited data See full deal
at idmobile.co.uk
(opens in new window)
If you need even more data, the next best SIM only plan on iD Mobile in our opinion is their discounted 1‑month one below. For £18 £16 a month, you get unlimited data, plus unlimited minutes and texts:
It’s a discount of £2 a month against the full price, adding up to a £24 saving over a year.
It's currently the best priced unlimited data 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's which other networks can beat it:
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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