To stop all calls going to Voicemail, simply Dial 1214
- To forward calls when you don't answer to your Voicemail - Dial 1211 (conditional diversion)
- To disable this feature - Dial 1214
- To forward all calls to your Voicemail without ringing to your device - Dial 1212
- To disable this feature - Dial 1213
Call Catcher is an alternative to voicemail which gives your callers the option to send their contact number to you via TXT, if you can't answer their call.
See article: How to manage Call Catcher settings from your phone.