Best SIM offers on iD Mobile: 20GB for £6, 40GB for £7
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Compare pricing on iD's SIM only this month vs all the other UK mobile networks. We've identified their best options. Last updated: 16th February 2026.
iD Mobile's best SIM only deals
Our favourite SIM only deal of the month on iD Mobile
just
£6
a month
✔ Unlimited mins and 20GB data See full deal
at idmobile.co.uk
(opens in new window)
From all the options iD Mobile have got available this February on SIM only, we think this discounted £6 1‑month deal is their best. For your £6 a month, you get 20GB data alongside unlimited minutes and texts:
No other networks can currently beat iD's pricing here for a SIM only deal with 20GB data or more. Have a look at the nearest plans with other providers under the dropdown below:
Their £7 SIM with 40GB is our next favourite this February
just
£7
a month
✔ Unlimited mins and 40GB data See full deal
at idmobile.co.uk
(opens in new window)
If you want more data, we think this discounted 40GB is one of the best SIM only plans on iD Mobile too. It's on a 1‑month deal, comes with unlimited minutes and texts - all for £7 a month:
iD have actually got the best price in the UK at the moment for a SIM only deal 40GB data or more. If you want to see the plans other networks this beats, use the dropdown below:
We also like their £8 for 60GB plan
just
£8
a month
✔ Unlimited mins and 60GB data See full deal
at idmobile.co.uk
(opens in new window)
For even more data, we also think this discounted £8 iD Mobile SIM is one of their best options. It comes with 60GB data, unlimited minutes and texts on a 1‑month deal:
That's actually the best price for a SIM only deal with 60GB data or more in the UK at the moment - so credit to iD. Use the dropdown below to see other networks' closest plans:
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)
If you're even more data-hungry, 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:
With £1 off per month, the total saving if you spent a year on the deal adds up to £12.
There are currently no other SIM only deals with 108GB data or more on other networks that can beat iD's plan here. Here are other providers' closest efforts anyway:
iD's unlimited data for £15 plan is a good option too
just
£15
a month
✔ Unlimited mins and unlimited data See full deal
at idmobile.co.uk
(opens in new window)
To satisfy even bigger data needs, the next best SIM only plan on iD Mobile in our opinion is their discounted 1‑month one below. For £18 £15 a month, you get unlimited data, plus unlimited minutes and texts:
You’ll save £36 if you stayed on the deal a whole year, adding up that £3 monthly saving.
This is actually the leading price in the UK at the moment for a SIM only deal with unlimited data. The plans under the dropdown are the next nearest you can get to iD with other providers:
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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