But if you feel the outage caused you significant problems or you waited a long time for repairs to take place, it's worth complaining and asking for a refund on your bill or compensation.
To complain, you need to follow O2's formal complaints procedure.
If your problem is still unresolved after eight weeks you can submit your complaint to an independent Alternative Dispute Resolution (ADR) scheme.
Telecoms regulator Ofcom has approved two ADR schemes – CISAS and Ombudsman Services: Communications. O2 is a member of the Ombudsman Services scheme.
O2 told The Sun it is "reviewing" how it can "make it up to our customers". We'll update this news story if we hear any more.
Millions of O2 customers woke up to 'no service' warnings yesterday, following an overnight service outage on the network.
It is estimated 32million people were left without online access, with O2 blaming it on a software issue with a third party supplier called Ericsson.
O2 says the problems are resolved as of this morning (December 7). An O2 spokesperson said: "We can now report that our 4G network has been restored.
"Our technical teams will continue to monitor service performance closely over the next few days to ensure we remain stable.
"A review will be carried out with Ericsson to understand fully what happened.
"We’d like to thank our customers for their patience during the loss of service on Thursday 6 December and we’re sorry for any impact the issue may have caused."
O2 customers have been mocking the mobile network over its 4G data outage.
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