By Mark Duell for MailOnline
Published: 06:57 GMT, 6 December 2018 | Updated: 16:41 GMT, 6 December 2018
Up to 32million O2 customers have been unable to access the internet since the early hours of this morning, sparking dozens of angry tweets from users.
Customers told of their anger on Twitter, with some saying losing coverage was becoming a regular problem - and others unable to use the sat navs on their phone.
Users of Britain's second biggest phone network started reporting problems at 4.50am - and O2 representatives on social media said they were 'terribly sorry'.
People also found the problems affected mobile payment services including Apple and Google Pay, while others urged O2 to provide compensation for the outage.
Thousands of O2 mobile phone users faced trouble using their 4G data today (file picture)
BBC presenter Dan Walker and rapper Yungen tweeted they were among the millions of customers who have not been able to access internet services via their phone data.
Dan Walker tweeted: 'Anyone know how long this #O2Down business is going on for @O2? I’m currently having to talk to people and look them in the face... it’s very disconcerting.'
Yungen said: 'Another couple hours of this nonsense @O2 and I’m changing networks. Smh.'
Other O2 customers expressed their anger online, saying the felt the service provider should have warned them about the outage.
Dipesh Parag, of Northamptonshire, tweeted: 'Once again O2