Be careful!!! So i had top up with O2 6 years, they call me asking if i wanna contract for 18£ per month for a year i agree... After 4 months they call me again for better deal 20£ per month. So i told them i just got a contract and they was saying we know we wanna suggest a better deal for you, so i asked what it will be with my old one? They told me it will ended automatically no extra charges. So i agree.... I got a new sim card but on my o2 account it wasn't saying anything about a new contract, so i connected with them to found out what is going on... And again bin told old contract will end automatically without no extra charges.... After month i get a message from my bank that i bin charged 104£ from o2.... Apparently they charged from old contract..... No email, no call nothing.....