*20 - Call Forwarding (Include Destination Number) Example: *20 2164522300
*21 - Disable Call Forwarding
*22 - Do Not Disturb - Send To Busy
*23 - Do Not Disturb - Send To Voicemail
*24 - Disable Failover Number
*25 - Set Failove Number (Include Destination Number) Example: *25 2164522300
*26 - Set Failover To Voicemail
*27 - Blacklist Last Caller
*67 - Block Caller ID (For Next Call Only)
*30 - Block Caller ID (For All Calls)
*31 - Unblock Caller ID (For All Calls)
*68 - Unblock Caller ID (For One Call)
*69 - Call Return (Call Last Number That Called In)
123 - Access Voicemail
