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For sims so small, they really pack a punch. They all come connected to O2's superfast 4G network that now covers 98% of the UK. And when you're not using your data, use theirs, at one of 15,000 free wifi hotspots nationwide.
Adventuring further afield? Call, chat and surf across the continent as if you were at home, with EuropeZone roaming at no extra cost.
You'll no doubt be aware that different handsets take different size SIMs, with nano, micro and standard being the main options. There's no need to worry about what size you need when ordering, as all our O2 SIM only deals are dispatched as a 'combination SIM' which can be resized to fit any SIM tray.
If you're someone who likes to keep their options open, why not go for one of the rolling 30 day or 12 month O2 sim only contracts? They come with all the perks of a standard Sim only contract but don't tie you down to the handset you choose.
Tempted by an O2 mobile deal? Here's everything you need to know about O2, one of the UK's biggest networks.
If you're looking for a new mobile, there's two main ways to get some new tech in your pocket...
The SIM card is the heart of your smartphone. Without it you would not be able to make calls, send texts or connect to a data service to browse the web and send emails.