Comment by celsoazevedo

Seems to be a serious problem. It's not that hard to root a phone, install NSG, and look at this info. O2 is also the largest mobile network in the UK and they have contracts with the government...

It's disappointing that they didn't reply, but I'm not surprised. O2 seems to be a mess internally. Anything that can't be fixed by someone at a store takes ages to fix (eg: a bad number port). Their systems seem to be outdated, part of their user base still can't use VoLTE, their new 5G SA doesn't support voice and seems to over rely on n28 making it slow for many, their CTO blogs about leaving "vanity metrics behind"[0] even though they are usually the worst network for data, etc.

[0] https://news.virginmediao2.co.uk/leaving-the-vanity-metrics-...