on 16-11-2021 00:38
Cannot turn off my voicemail trued 1760 but just says messaging service has not been successful
16-11-2021 05:22 - edited 16-11-2021 05:23
16-11-2021 05:22 - edited 16-11-2021 05:23
Disable your WiFi calling
Reboot your phone
Dial 1760
Enable WiFi calling again
Also see this guide: All you need to know about O2 Voicemail 901. - O2 Community