Number of rings before voicemail

[Patience]

Is it possible to change the number of rings before a call goes to voicemail?

[jwhitaker80]

This is preset and cannot be changed.

[DDrake99]

I just put in new sim and reactivated for the network upgrade. My phone rings approximately 13 times before going to voice mail. Does anyone know how do I get that closer to 5 rings, or 20 seconds? Did the same activation to my wife's phone and hers works just fine (Goes to Voicemail after about 5 rings)