If you don’t want to use your voicemail service, you should probably disable it to stop getting messages. To disable voicemail on an Android phone:
- On your Android phone, click Settings
- Click Call Settings
- Click Call Forwarding
- Call forwarding will be setup to forward calls to your voicemail number when busy, unanswered or unreachable. Make a note of this number (because you might want to use it again) and click on each option, disabling it.
Voicemail will now be disabled.