Do NOT go with O2!!! I had been with O2 for the past 12 years, but over the past few years they switched their customer service from the UK to somewhere in Asia. The workers have NOT been trained on O2 products at all. It has taken them 6 months to cancel my airtime plan (which I am fully entitled to in my contract). I also did NOT receive a refund for the past 6 months, even though I wasn’t using the airtime plan (I moved to Australia, so got a new phone provider). I think it’s disgusting that they would do this to someone who has been with them for 12 years. I had been calling them nonstop over these months, and even constantly messaging on the app in which they would always end my chat or hang up the call. Initially they told me I had to wait to cancel my airtime plan (which I did), and then when I contacted them again after waiting, the workers were confused and didn’t know you could split an airtime plan and a device plan. I sent them screenshots of a previous worker who told me I could do this and to wait, alongside screenshots of where it says you can cancel online and also screenshots in the contract. Again, they’d just end the chat or hang up. I’m not sure if they just didn’t want me to cancel or if they are uneducated. Let’s not forget to note that most of the time they do not pick up the phone either, or the chat option says they’re unavailable on the app - so this was EXTREMELY painful when I would get through and they’d end the chat. I never ever complain or leave bad reviews, but I was so frustrated I was crying after each conversation - I’ve never received such poor customer service from a business. Most of the workers I spoke to were also very rude (despite me being polite). Also - somehow from December 2023 to Jan 2024 my FIXED airtime plan increased from £25 to £55. Every time I asked about this they just told me this happened to all phone companies, which is not true. If you want to keep your sanity and YOUR MONEY, do not go with O2.