Can i get a mobile contract with only having a post office account?
It depends on where you go for the contract. Some networks have systems to verify your identity without the need for bank statements etc. If they can’t verify you using the online system you will need proof of address (utility bill ie: gas, electric, telephone, council tax) and proof of signature (ie: passport, driving license, provisional license, credit or debit card) You do not need a direct debit bank account to take out a mobile contract though.