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Voice mails are set up from the phone company. Your phone has no control over the voice mailing service other than assigning a speed dial to it. You should call your phone company on their customer service number and they will tell your the number to call for setting up your voice mail box.
Pls fist put you sim in deffrent mobile and call to you number and you call is going to voice mail so going to voicemail so ok Thats you mobile problem but if you no going voice mail so active you voice mail device call to service proivedar of you network ...ok
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
Write down the xxxYYYzzz number (including +1) - this is the number to
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.
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
To find out what it is and try
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  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.
Dial your phone number from the phone you are using to check your voice mail. Let the phone ring until the voice mail message begins. . Step 2
Press the "*" key or the "#" key while the message is playing. One of these two keys is usually the key that activates access to your messages. This will work for most answering machines and voice mail services, although some may use a different key code .
Enter your password or passcode. For most systems, this will be a four-digit number that is keyed in and will sometimes be followed by the "#" key.
Listen to your messages. Usually, unheard messages are played back first, followed by any saved messages on the system. Systems vary as to whether the oldest or newest unheard messages first.