Shocking service, blatantly lied to sign me into a contract telling me I could use my phone worldwide with no extra charges, when I started receiving charges I contacted the customer service team who quite frankly were useless, uncaring and unhelpful. They made no attempts to resolve the problem and we kept going round in circles. I opened formal complaints to which I was offered to leave O2, I asked about what to do with my number as my personal and business banking and email are attached. I of course received no such contact and 2 months later they blocked my account. I have tried contacting several times and when they put me through a supervisor they literally ignore me. How are they allowed to do this? I am out of the country (hence the travel sim) so unable to contact them. Its disgusting. Avoid at all costs.