Unlimited Data SIM

Now there's no limit to what you can do.

Unlimited Data SIM Plans & Deals

Enjoy Unlimited data with our custom plans. Available on phones, tablets, smartwatches, and our SIM Only deals with unlimited data.


Unlimited Data SIM FAQs

Can I use my unlimited data SIM card abroad?

Our unlimited data SIM plans provide 4G and 5G ready coverage across the UK – but rest assured. You can select a Pay Monthly Unlimited Plus plan and choose O2 Travel as one of your Extras to get 25GB free international roaming data in our Europe Zones. If you’re travelling within an Inclusive Zone, your allowances will work as they do in the UK. Outside Europe, you can Bolt On all the minutes, texts and data you need across many destinations worldwide (including USA, Canada, Australia, New Zealand and Mexico) at a fixed day rate.

What is the 4G and 5G coverage like?

Make the most of O2’s renowned network with a 5G ready phone and SIM card. Location may affect mobile data reception so check if 4G and 5G coverage is available in your selected area.

What SIM card do I need for unlimited data only?

Grab preloaded Data Only SIM deals for tablets and dongles. Top up whenever is best for you – no contract needed. Or, treat yourself to superfast 4G & 5G routers with unlimited data plans to stay connected on your travels with a reliable mobile hotspot for several devices at once.

Do I need unlimited data if I have Wi-Fi?

Unlimited data can be a life saver when you’re on the go. No worrying about running out when you need it the most. Whether navigating to a destination or putting on your favourite tunes and TV shows on the way home, the world remains at your fingertips with an unlimited data SIM plan. Plus, when broadband Wi-Fi is out of range, you can switch up to mobile data in an instant - perfect for gaming, streaming, and social media.

Why O2?

† The monthly price of your Airtime Plan will increase each April from April 2025 by the Retail Price Index rate of inflation announced in February each year plus 3.9%. If RPI is negative, we'll only apply the 3.9%. See http://o2.co.uk/prices