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Old 06-06-2008, 01:22 PM   #8 (permalink)
fonejunkie
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Join Date: Jul 2006
Model: iFone
OS: iOS4
PIN: Not on my iPhone5
Carrier: iPhone5 on AT&T Mobility
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AT&T will change it for you. There is also a GSM code that you should be able to enter from your phone to change it yourself.

From the AT&T Forum (link):
Quote:
The max time is 30 seconds. You can either call customer service and have them set the number of seconds or you can use these instructions:

You can use the following codes to control the delay from 5 to 30 seconds on any GSM phone:
  1. To get the current call forwarding status, enter *#61#[SEND] into your phone.
  2. Write down the 10-digit number(ignore the +1), this is the phone number that your calls are currently being diverted to.
  3. Enter **61*[10 digit number]*11*[delay]#[SEND] into your phone using the phone number (numbers only) as reported by the status & the delay can be set to (5, 10, 15, 20, 25, or 30) seconds.
  4. To verify that the settings are correct, enter *#61#[SEND] into your phone.
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