Best SIM only on Sky Mobile: 10GB for £6, 50GB for £11
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We show you the best choices in Sky's SIM only range this month, after comparing them against every other network. Last updated: 9th January 2026.
Sky's best SIM only deals
The best overall SIM only deal this month on Sky Mobile
just
£6
a month
✔ Unlimited mins and 10GB data See full deal
at sky.com
(opens in new window)
Out of all the SIM only plans available this January on Sky Mobile, we'd say their best value deal is their discounted 12‑month SIM below, which gets you 10GB data, plus unlimited minutes and texts for £6 a month:
It might not be the lowest-cost SIM only deal with 10GB data or more on the entire market but if you're sure you need a SIM using the O2 network, it is the best-priced. Here's where you can beat it on other networks:
Their 50GB for £11 SIM is another good option
just
£11
a month
✔ Unlimited mins and 50GB data See full deal
at sky.com
(opens in new window)
To get more data, Sky Mobile are also offering this discounted £11 SIM, which includes 50GB data, unlimited minutes and texts on a 12‑month plan. It's another of their best deals:
It does enough to get into our pick of Sky's best SIMs but that doesn't mean it's unbeatable on price. Other providers (even ones that use the O2 network) can beat it. See lower-priced networks' deals here:
Sky's unlimited data for £20 plan is a good option too
just
£20
a month
✔ Unlimited mins and unlimited data See full deal
at sky.com
(opens in new window)
For people who need even more data, you might like the discounted £20 SIM only deal running on Sky Mobile at the moment. It's a 12‑month plan, which comes with unlimited data, unlimited minutes and texts too:
It isn't actually the cheapest unlimited data SIM available overall this month but if you definitely need your plan to use the O2 network, it is the lowest cost option. Here are other networks you can beat it on:
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How Sky Mobile’s SIM only prices and benefits stack up
In our Sky Mobile review we rated them highly for giving you full access to O2’s excellent network for call signal and 5G coverage, while offering lots of nice benefits on top (see our O2 vs Sky Mobile review here).
Their SIM plans are all on 12-month contracts and they don’t offer unlimited data plans, so they don’t offer as much choice as some networks. But there’s still a wide range of plans (find their best deals here).
Sky’s best value deals tend to be their mid-range data deals. They’re a cheaper way of getting onto the O2 network than going with O2 directly while also offering some great benefits that O2 don’t:
They offer an excellent unlimited free streaming data scheme on Sky TV apps and a great data rollover scheme that lets you keep data for 3 years. And you can gift data to other users on your account if need be.
Useful link: Read our full Sky Mobile review
What else you should know about Sky Mobile’s SIM only plans
You’ll get your SIM package within 1-3 working days of ordering. Your SIM package will come with each size of SIM to put into any phone. You can’t get an eSIM on Sky yet (these networks offer them).
Once your SIM card arrives, you have 14 days to cancel your SIM to get a full refund if you’re not happy with it. Here are the full details on how to do that.
To get on a Sky Mobile SIM only contract you’ll have to pass a credit check. There’s no way to pay as you go or buy a monthly bundle to avoid this.
If you want to switch from another network to Sky while keeping your number, you’ll have to request a PAC from your old network and send it to Sky. Here’s their full guide on how to do it.
Useful link: Compare all Sky SIMs