Sky Mobile SIM Only Deals

Compare Sky Mobile SIM only deals, updated daily. Sky Mobile runs on O2's network and every plan here comes with unlimited minutes and texts, 5G, and data rollover into a Sky Piggybank. All the deals listed are 12 month SIM only contracts, starting from £6.00 a month, and the standout is the 50GB deal at £11.00. Be aware that Sky Mobile applies annual price rises, most recently £1.50 a month in February. Our mid-contract price rises guide explains how these work.

Which network does Sky Mobile run on?

Sky Mobile is an MVNO, so it owns no masts of its own. It buys wholesale access from O2, which means the signal on your phone is the same O2 signal an O2 customer would get in the same spot, across both 4G and 5G. If O2 works well where you live and work, Sky Mobile will perform identically. If you are not sure, our network coverage guide shows you how to check before you buy.

Do I need a credit check on a Sky Mobile SIM only contract?

Yes. Sky Mobile runs a credit check on every SIM only plan, including for existing Sky customers, and with every deal here on a 12 month contract there is no rolling option that skips it. If that is a concern, our no credit check SIM only deals page compares the networks that do not run one.

Which Sky Mobile deal is worth your money right now?

The 50GB deal at £11.00 a month is the pick: unlimited minutes and texts, 5G, and enough data that most people will bank a surplus every month. Two pricing quirks are worth knowing. The 3GB and 10GB plans both cost £6.00 a month, so there is no reason to take the 3GB. And the 5GB plan at £12.00 currently costs more than the 50GB at £11.00, so skip it entirely. If you need unlimited data, Sky's £20.00 plan is reasonable but excludes the Piggybank rollover, and our unlimited data SIM only deals page lists cheaper options.

How does Sky Mobile's data rollover work?

Any data you do not use in a month rolls into your Sky Piggybank automatically, where it stays available for 12 months. You can withdraw it in 1GB chunks, share it with family members on the same account, or exchange it for discounts on devices. Older guides quote a three year window, but that changed and the limit is now one year. It remains one of the most generous schemes around, and our data rollover guide compares the alternatives. If you have Sky TV, streaming Sky's own apps does not count against your allowance either.

Can I use my Sky Mobile SIM abroad?

Sky Mobile does not include free EU roaming on any plan, which is its biggest weakness against rivals. Instead, Roaming Passport Plus lets you use your UK allowances in 120 destinations, including the EU, USA and Australia, for £2 a day, activating automatically when you call, text, or use more than 10MB of data abroad. A 25GB fair usage limit applies per billing cycle. A week in Spain works out at £14, fine for the odd holiday but costly if you travel often.

Can I get an eSIM on a Sky Mobile SIM only contract?

Yes. Every Sky Mobile deal listed is available as a physical SIM or an eSIM, so you can be connected without waiting for the post. Our eSIM guide explains how to check your phone supports one, and you can browse eSIM only deals across every network.

Does 5G come as standard on Sky Mobile SIM only deals?

Yes. Every Sky Mobile deal listed includes 5G at no extra cost. Whether you get 5G speeds depends on having a 5G compatible phone and being somewhere with O2 5G coverage, which is strongest in towns and cities.

How does Sky Mobile compare with other networks?

If you are still deciding between Sky Mobile and its rivals, our full Sky Mobile review compares it head to head with Tesco Mobile, Giffgaff, and iD Mobile across coverage, price, roaming, rollover, and customer service, with a clear verdict on who each network suits. Once you have decided, switching to Sky Mobile and keeping your number is straightforward with our Sky Mobile switching guide.

How we rank Sky Mobile SIM only deals

By default, deals are sorted by lowest monthly price. You can change the sort order at any time using the controls above the listings and filter by data allowance, contract length, minutes, and eSIM availability. All deals shown are updated automatically. SIM Only Finder is an Ofcom-accredited UK mobile comparison site and earns a commission on deals taken out via our links. This does not affect how deals are ranked.