Change Apple iPhone Ring time Delay before Forwarding to Voice Mail
By default, the Apple iPhone will forward to voice mail after 20 seconds if you do not answer your phone. You can change the length in two ways. The first way is to call AT&T to request the change. If you do not like to talk to service rep, you can also change the length yourself through the following steps.
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Change Apple iPhone Ring Time Delay Before Forwarding to Voice Mail
andrew8062

(2 votes)
andrew8062 12:26 pm on November 9, 2009
Note: substitute the text [voice mail id] with the number you just saw on step 2. Also substitute [length] with your desired ring length.
For example, this is similar to what you would dial after replacing the numbers:
Where:
“18621513862″ is the voice mail id in this example.
“25″ is the length in seconds for the ring length. (30 seconds is the maximum allowed)