By default your phone rings for 15 seconds before diverting to MessageBank. To extend the ring time, enter the following on your mobile phone:
**61*101** (number of seconds: 15, 20, 25 or 30) #.
Then press the call/send button.
To set the default ring time back to 15 seconds:
Restore all three conditional call forwarding settings (Busy, No Answer, No Reply) to MessageBank, enter **004*101 #
OR
Remove all three conditional call forwarding settings (Busy, No Answer, No Reply) to MessageBank, enter ##004 #