Forwarding calls on Windows Phone to your voicemail account is easy as pie. Besides forwarding calls to another phone number, you can also forward these calls to your voicemail, and listen to them later. Here is how you do it.
1. Tap > > settings.
2. For the first time, type in your default voicemail number in the Voicemail number box. Contact your service provider to get the default voicemail number.
3. If necessary, switch Use default voicemail number to On .
4. Switch Call forwarding to On , and type in your voicemail number in the Forward calls to box. Edit your voicemail number Tap > > settings, switch Use default voicemail number to Off , and edit your voicemail number. Use the same voicemail number in the Forward calls to box.