O2...worst network in UK. Can't get phone signal in the middle of Edinburgh. 4G almost non-existent. Support is a special level of hell. Trying to leave O2 is like nothing else I have ever experienced. Round and round in circles. My O2 app, website, website chatbot, chat with agents, calls to call center. Want to unlock your phone so you can go to a new network? That will be 7 DAYS. The call centre people say..."pop in a new SIM and off you go". Not true. You call back. "Oh, I see your phone is blocked, and locked, and latched and needs unblocked unlocked unlatched undressed unfettered." Eh? "I have fixed it. Just wait until the next time St Swithens Day falls on a Tuesday that begins with F and happens during a leap year and a full moon." How many days now, I do not know. It's all a blur now. I just want to get the hell off O2. Please let me go.