I'm running Cyanogenmod 7. When I call my Android phone, it rings for 30 seconds before timing out and directing to my voicemail. I want it to only ring for 20 seconds before timing out - how can I change this? Is there somewhere in the Android GUI for me to set it?
OK, this is indeed a setting which is determined by the carrier. It can be changed (at least on GSM networks, according to this Tech Recipes article), using an MMI code (Man-Machine Interface code). Here's the procedure that worked for me:
On your Android phone, go to your Phone app, dial
Next, go to your Phone app and then the keypad. Now dial this number from the keypad to change the time your phone will ring before it goes to voicemail:
... and then hit the call button.
In the above code, you will put your voicemail number where the
Delay is in five second increments with the maximum being 30 seconds (ie. 5, 10, 15, 20, 25, 30 secs).
So for example, if my voicemail number is
Apparently, this will work for AT&T, T-Mobile, and any other GSM / SIM Card Carrier and may work on other phones besides Android devices.
Personally I am in the UK and so my voicemail number starts +44, so my MMI code to change the voicemail timeout was more like this:
It worked perfectly for me, and set the voicemail timeout to 20 seconds.