How in the blue hell do I get rid of this voicemail notification?. I haven't even got any voicemail to listen too. (O2 UK) And clearing the app data/cache under apps/phone isn't working either!?
Just a suggestion but searching Voice Mail Number in the phone settings.Then tap on Notifications and turn off the App Icon Badges switch. It might remove the notification if that is disabled for a few seconds 🤞🏻
If that doesn't help, maybe power off your phone and remove the SIM card. Power back on without the SIM card in and see if it's gone. If it has then power off, put SIM back in and reboot. Drastic and teeth grinding I know (lol) but maybe it might do the trick and remove the notification once and for all 🤞🏻