Irresponsible and unprofessional network who doesn’t care about their customers. I was a loyal O2 customer for a long time. A few days ago, I upgraded my plan and kept everything the same. After the upgrade, my onscreen voicemail stopped working. I contacted O2 CS, after a long waste of time on the phone, they informed me that they made some changes, so it will take 24 hours to active this. The next morning I had no service. I tried calling my number and it was saying that the number doesn’t exist! I called this useless company again. They said, there is a techical issue with your number which will be resolved within 5 days. O2 must he absolutely mad thinking that they could get away with first switching me off because one of their unintelligent staff didn’t have a clue what he was doing, secondly instead of apologising and getting this resolved they told me that I would have to wait for 5 working days. I called them up after 3 days of not having my phone and told them to cancel my contact. I would never come back to this irresponsible company again and I will be making a complaint to the ombudsman and reporting them to watchdog. Avoid them, unless you want to be left without a phone one day.