People are phoning in to 5 live saying they have lost work as they haven't been able to use their apps it seems people have become over reliant on phones and have no back up in case anything goes wrong, is this a little short sighted? O2 says it does not know when full service will be restored to millions of customers who cannot access data services on their smartphones. The mobile network said it was working "flat out" with Ericsson to fix the technical problems. The Swedish company, which makes mobile network equipment, confirmed that an issue with its software was to blame. Services such as bus timetable information have also been affected, while many businesses faced disruption. O2 has 25 million customers and also provides services for the Sky, Tesco, Giffgaff and Lycamobile networks, which have another seven million users. "The network issue we are currently experiencing remains a top priority for us and we are working as quickly as possible to fix the issue," O2 said. Its chief executive, Mark Evans, tweeted to "reassure our customers that we are doing everything we can to fix the issue with our network". https://www.bbc.co.uk/news/business-46464730 .