To setup voicemail, dial 141 and follow the prompts.
You can choose how long your mobile rings for before diverting to mobile by dialling the following code: **61*61141**XX# - the XX represents the number of seconds you wish to wait before the call is diverted to voicemail. So if you want your phone to ring for 30 seconds, dial: **61*61141**30#
Note: There are 4 ring times you can choose from: 15 (default), 20, 25 and 30.
To deactivate voicemail, dial ##002# - this means your phone will ring until the caller hangs up.