Urgent !!!!!!!!!!!! o2 credit balance check?

Hi Connor normally to get your balance on the screen you just type *#10# & press then click on the send button as though your calling someone & will will come up with please wait & your credit will be displayed on the screen it works ok on my x8 unless theres a problem with o2 themselves the other way of trying it is in the menu on the phone it should have a symbol of a sim card go into that & it will have all the o2 bits your need in there ... hope this helps .. sly