With My O2, you can manage your account and bills online. You can check your usage, make payments, unlock your device and more. How to pay · Viewing your bill · Paying your final bill · Changing address in My O2. Get help on how to pay your O2 mobile bill. Help: Bill and phone help, O2 Gurus and more · Browse Help · All Help If your Direct Debit fails, you can make a card payment in My O2 and we won't try to take the same payment again. You can. i need to pay my bill online and i cantt make it in to an o2 shop. that is a big issue when i can do it over the phone.