Telefónica in Germany now also offers payment through mobile phone billing for the Windows Store. This way, all O2 contract and prepaid. Solved: I want to pay my bill but my phone is off can customer services call me to pay it? Help!!!!!! You can pay it online via my o2. Inactive · Formerly O2 Ireland Can I pay my O2 bill via bank transfer We're online: Monday - Friday: O2 Bank Account Number -.