O2 is one of the most popular UK networks driven by great customer service


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About O2

O2 is the second oldest mobile network operator in the UK, launching way back in 1985 under the name of Cellnet. The network rebranded as O2 in 2001 and has been operating under the same name since then. With over 34 million customers, O2 is the second-largest UK mobile network operator, being only behind EE.


Does O2 support 5G?
Yes, O2 offers 5G coverage. However, at the time of writing O2’s 5G has the least amount of towns and cities covered.

Does O2 have Wi-Fi Calling?
Yes, O2 has Wi-Fi Calling. To benefit from this feature you have to be on a SIM Only contract and your device must be compatible.

Is O2 Priority free?

Yes, O2 Priority is a free loyalty programme exclusively for O2 customers. However, while you’re on the app you’ll be using data.