O2 outage: customers told to turn off 3G data to get service Hundreds of thousands of O2 customers were unable to use their mobile phones after the operator's network crashed. Photograph: Andy Hepburn/PA The network blackout affecting hundreds of thousands of O2 customers has continued into a second day. O2 said on Thursday morning that customers affected should be able to begin making calls and sending text messages if they turned off their 3G mobile data. However, many users told the Guardian that they were still unable to connect to the network. O2 is still unable to say when its network will be fully restored after disruption hit hundreds of thousands of its 23 million UK customers on Wednesday afternoon and overnight. But the company said on Thursday morning that users should be able to make calls and text messages, and use 2G data, if they switch off the 3G option for mobile data use. The mobile network said in a statement: "We can confirm that our 2G network service has now been restored. Customers who were affected should now be able to make and receive calls. Our 3G service is starting to restore and customers should expect to see a gradual return of data services as the day progresses. Customers affected may wish to try switching their mobile phones off and on as service returns. We are sorry again for the inconvenience this has caused and can provide reassurance that we continue to deploy all possible resources and will do so until full service is restored. O2 customers found they were unable to make calls or send and receive text messages from about mid-afternoon on Wednesday. The disruption continued throughout the night and into early Thursday morning. However, several customers told the Guardian they were still unable to send or receive calls about 9am on Thursday. Twitter user @UrbanManc said: "That's a lie , I can't make or receive calls and texts," while Ronnie Simon complained: "Still not able to make calls. Thanks a bunch O2. Some O2 customers who were not affected yesterday also claimed to have been disrupted on Thursday, in a sign that the network outage spread further overnight. One customer, Jo Phipps, posted on Facebook: "My o2 phone been down for 6 hours ... whats going on?" Twitter user Bethany Kemp said: "It's ridiculous, haven't had a signal since 1pm. O2 is urging customers to check their Twitter and Facebook feeds for updates, but the company's webpage - which displays live information about network coverage - has crashed.