Giffgaff uses the O2 network. Giffgaff is a 'virtual' provider, which means it uses another provider's infrastructure – in this case O2's. It offers 3G, 4G and 5G coverage.

Is giffgaff coverage as good as O2?

Giffgaff's coverage relies on O2's, which means it's currently at around 99% 4G population coverage indoors. That puts it behind Three and EE and in line with Vodafone. Giffgaff also has strong 3G and 2G coverage, so you should be able to get mobile data of some kind almost everywhere.

What carrier is giffgaff with?

We run on the O2 network, so 4G coverage is standard.