If i could give negative stars i would. I decided to leave o2 because the signal around my area is bad, so i was happily paying out the rest of my contact to leave to a network with better coverage. The women on the phone was explaining that i get charged the rest of my contract plus any additional days i use the phone until the number disconnects, which i did not understand and was trying to get her to explain better as that would mean paying twice. I asked to speak to a manager as maybe she was not explaining very well but she started getting very angry on the phone and raised her voice. At this point i had not raised my voice or got angry. This is the first time in my life i have experienced such appalling customer service… i was shocked. I still do not understand what she was trying to say as i don't understand paying until the end of my contact now, then getting charged again for any days i use the phone until i switch my number. I recommend to avoid o2, i have been to many places in the UK and never had much signal… had better with smaller companies like Smarty. That with the terrible customer service makes it a company never to waste your money with.