The following dial codes can be used to change the amount of time your phone will ring for before going to message bank.
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Please note these codes only apply to mobile phones on the Telstra, Optus and Three mobile phone networks.
Telstra
**61*61101**xx#
Three
**61*333**xx#
Optus
**61*321**xx#
xx = time in seconds, up to 30 but must be in 5 second increments (i.e. 5, 10, 15, 20, 25, 30).
For example, a Telstra mobile phone would dial
**61*61101**30#