Customer service the worst I’ve ever experienced. My son upgraded in store, which he has done several times. This time he ended up with his original phone number and a new number, so one phone but two contracts. This only came to light when o2 sent him a debt chasing letter for the new number he wasn’t aware of. Three separate calls to o2, all of which said something different. The third call lasted 1hour 35mins with a call handler who hadn’t a clue how to deal with it, spoke at a million miles an hour so couldn’t understand her, had to keep asking her to slow down. She kept putting me on hold while she went to ask other people. By the end of it all I was so stressed I felt nauseous. These people need training, properly. I would never recommend o2 to anyone.