It depends on which system o2 have you on @Fungifips (they are moving customers to a new system in the background).
If you are on the old system, then customer services need to turn on WiFi calling on your account.
24 hours later you turn it on in your My o2.
24 later you then can turn it on in the phone settings.
If you are on the new system (called 360), you can turn it on yourself without contacting customer services, but the rest remains true.
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
