You can divert your incoming calls to your voice mailbox. Callers can also leave you a message if you do not answer. Voice mailbox is a network service.
On the home screen, select , and select and hold 1.
Change the phone number of your voice mailbox
Select > Settings and Calling > Call mailbox.
Select and hold the mailbox, and from the pop-up menu, select Change number.
Enter the number (obtained from your network service provider), and select OK.