Our 4G network was restored earlier this morning. Our technical teams will continue to monitor service performance closely and we're starting the full review to understand what happened. We are really sorry for the issues yesterday.

@O2 It's ok O2. You didn't do it on purpose. Stuff happens. Don't worry 😘

@O2 I'm still getting failed message messages but they're going through - sometimes by the dozen!

@O2 Hi. I can't make calls it's saying 'can't activate 4G!' Why is this happening if you've restored all services???

@O2 Still no text and call service in Northern Ireland??? So frustrating !! When is it expected to be working ??

@O2 Still not working can not send text

@O2 O2 are having a laugh,you lost my business all communications for a day & some & you then have the front to charge me for 1 FOR 1 MMS message outside my contract.Do you know how much work you have lost me through your issues?No neither do I as I couldn't get any calls

@O2 Still having problems.

@O2 My messages still not sending

@O2 Mine still isn’t working properly keeps saying message failed to send

@O2 The network services aren’t working still

@O2 Im on pay and go and my texts are still not working. When will this be looked at??

@O2 No texts or calls this morning so your update is wrong!!

@O2 When I asked O2 advisor how they'll make up for network outage, response was I'll get call tonight when they're ready. Explaining that I can't answer the phone as I'm a religious Jew, I was told well that's what we're doing so if you can't answer that's your fault. Disgraceful!!

@O2 Hi O2, whilst I think it's a lovely gesture to refund me 2 days airtime due to the outage, would you donate every customers refund to a charity instead? There are far more people in need than the people affected by this outage. Feed the homeless instead this Christmas?? #O2

@O2 Thanks guys. I couldn't put a bet on all day yesterday using my apps. Saved me a fortune. Please do this 3 times a week .

@O2 I still love you O2, you're the best!