Solve voicemail not working on iPhone
There are many people who have faced problems with voicemail not working on iPhone. If you are one of them and also looking for how to solve the problem of voicemail not working then you can try few settings by which you can solve this issue.
Users need to make sure that their call forwarding options are off. Go to Settings > Calls > Call setting > Call forwarding.
Voicemail application should be updated.
Check space in the voicemail app.
Force close and re-open the voicemail app.
Check Cellular data or wifi whatever you are using. The Internet should be on.