22-01-2018 13:09 - edited 22-01-2018 13:10
Easiest way is to call customer service http://www.o2.co.uk/contactus
There's a form here too you can fill in http://static.o2.co.uk/assets2/pdf/O2_DirectDebitMandate.pdf
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
22-01-2018 13:27 - edited 22-01-2018 13:31
@mcradiant. This should have been set up automatically when you took out your contract. Did you opt out of paying via this route?
This is the method which is part of O2 terms and conditions when you take out a contract phone and is certainly most convenient way to pay your monthly bill. Account details are given at start of contract and O2 automatically set up direct debit. Paying via direct debit ensures your bill is paid on time. O2 will email the customer the day after the bill is produced. You can check your bill via My O2