contract billing

Good Day

I have a contract with o2 handy only, I want to know why I don't get any 

billing payment emails or letters to be able to see how much I have paid 

on my contracts and the status of amount and months due

I have have been searching all over for any clue, but it wants me to register with

o2 contact number which I don't have, I only have device contract  

Edit by o2_Steffen: Beitrag verschoben o2 my Handy → English o2 Community: Mobile