This procedure allows your iPhone to ring for longer or shorter periods than the default setting of 20 seconds before voicemail answers. *** Attempt at your own risk but if you pay attention to the keys you input and follow the directions you should have no problems.
1. On your phone, dial *#61# and click Call
The screen will display:
Setting Interrogation Succeeded
Voice Call Forwarding
When Unanswered
Forwards to +1xxxYYYzzzz
Enabled
2. Write down the xxxYYYzzz number (including +1) - this is the number to your voicemail.
3. In order to make the + appear on the keypad in the next step you’ll have to hold Zero down for a few seconds, then it will become a Plus (+). Dial **61*+1xxxYYYzzzz**30# and hit Call. +1xxxYYYzzzz is the number you wrote down previously, 30 is the delay in seconds. The delay can be set in 5 second increments, 30 is maximum.
4. Dial *#61# to verify that the new settings are active.
5. Verify working voice mail.
If you find you or your contacts are not being forwarded to your voice mail you have incorrectly altered your voice mail forward number.
To find out what it is and try again:
Dial ##002# and send. This will reset that forward number to factory defaults.
By then Dialing *#61# you will again display the your current (default) voice mail forwarding number.
Return to step [2] and continue.
*** Use this tutorial at your own risk ***…and if you have the time you can always give AT&T a call to have them change the number of rings on an incoming call before Visual Voicemail kicks in. I was able to quickly change the duration on my own, using these diagnostic iPhone GSM codes. The default time duration before Visual Voicemail intercepts the call is set by AT&T to 20 seconds. You will be able to add another 10 seconds yourself, but if you want your callers to wait more than 30 seconds before voicemail picks up then you’ll need to contact AT&T technical support - they can change the duration to 45 seconds upon request.
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