That is usually controlled by your cellphone company. I know you can do it by sending a command to the company from your phone (I did on my old Nokia while on AT&T) and some people have done it by calling customer service.
I believe it is changeable in 5 second increments with a maximum of 30 seconds.
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 T-Mobile Mail access number is 18056377243, 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.
I just stole that quote from BlackBerry FAQ - BlackBerryFAQ and it's pretty much what I had done when I had my N97 on AT&T
The phone will keep ringing until the call is forwarded. Your phone company controls when the call gets forwarded to your voicemail. The phone doesn't control this directly.
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