Everything you need to know about the O2 outage: Question and answer
When did the network problem start?
The first reports of a loss of access to 4G data services on the mobile network appeared on social media at 4.50am.
Who was affected?
Some 25million customers signed to the O2 network, plus another 7million with Tesco Mobile, Sky Mobile, GiffGaff and Lycamobile, which offer services over the same system.
What services were lost?
Access to the internet, emails and apps such as Google maps over the mobile network were lost. Some customers also reported smartphone payments were interrupted
Electronic bus timetable updates on London bus shelters failed.
What about voice calls?
Voice calls continued operating initially. However as more phone owners resorted to making calls rather than sending emails, customers found the system straining under pressure.
What was the cause?
O2 blames software systems operated by the Swedish tech giant Ericsson as part of a global failure that also hit Japan.
Are customers owed compensation?
When customers experienced a seven-hour blackout in 2015, O2 said it would not be offering compensation because of the 'length and effect of the incident'. It is not clear whether it will offer payouts in this case.
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