Why does a call immediately go to voicemail

- Why does a call go to voicemail
- Why does my call immediately go to voicemail
- Why does a call always go to voicemail
- Why does a call go straight to voicemail without ringing
- Why does a call go straight to voicemail without ringing iphone
- Why does a call go directly to voicemail
- Why does call go to voicemail on iphone
- Why does a call ring once and go to voicemail
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- Voice mailbox number