If I could give negative 10 stars I would. Absolutely TRASH customer service. Lies and lies and lies. They have loop holes to make you pay for things you did not agree to (example below). I have had to call REPEATEDLY to cancel my O2 contract. I moved back to the United States almost 2 months ago. I called in to CANCEL my O2 contract on October 30th, 2023. They said they will be sending me a final bill in 14 days - GREAT happy to pay that. Then a few weeks later I realize that not only has my contract NOT BEEN CANCELLED, they are still CHARGING ME!!! And then I call in with Customer Support (after almost 45 minutes on hold) and he is telling lie after lie saying that on October 30th I requested to keep my UK number which is why I'm still getting charged. I said that is absolutely not the case. On October 30th I specifically and repeatedly requested I DO NOT WANT NOR NEED THIS UK NUMBER. PLEASE CANCEL IT. I even told him to go listen to the recorded call, so he put me on hold for 5 minutes and went to go listen to it. Why would I need a UK number if I live in the United States?!??!!??! Then after he listened to the call from October 30th, he said he would credit me £60.17 and I said ok fine that is better than nothing (it should have been £75.40). Then he goes to get confirmation from his manager for the credit amount and puts me on hold again. After a few minutes he comes back and says, actually I can only credit you £30... WHAT??? Then we argue back and forth for another 10 minutes... to no avail. He says if I want the £60.17 credit I'll have to wait for a call back from his manager in the next few days. I said ok how about you credit me the £30 now and I'll await a call from you manager for the remaining £30.17. To which he responds, "no that won't work because the credit can only be applied once". ARE YOU KIDDING ME. O2 made the mistake by not cancelling my contract like they said they would and I'm the one who has to foot the bill for them not doing their job? So finally I just accept the £30 credit because what are the odds his manager actually calls me back? Also I'm based on the West Coast so he'd probably be calling me at like 2AM anyway... Needless to say, when you cancel your O2 contract, make sure you are ALLLLLL OVER IT because they will try to deceive you and keep charging you. Or if you can avoid them all together, do that.