If you do need additional ring time before voicemail:

A) The simplest method is to call your carrier and request a longer ring time, up to 30 seconds.

B) If you have a GSM based phone, some have had success by dialing this number from your phone: **61*XXXXXXXXXXX**30#

Replace XXXXXXXXXXX with the number of your carrier voice mail center (find it by looking at your Phone Dialer > Options > VoiceMail > Access Number. Put your access number in place of the Xs above.
For example, the Vodafone uk voice mail access number is 121, and thus the string to dial would be **61*18056377243**30#

Replace the 30 at the end of the string with your desired seconds. For most carriers, 30 seconds is the longest allowed.

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