I'm not aware of any way to make a phone ring more times than what it does. You may have the option to use other features like voice answer, pressing a certain key on the phone for faster answer etc. I find those features on my phone under the dialer screen and then selecting options.
There is a standard time frame set on our network. The length of time your device rings, before forwarding to Voice Mail or Caller Unavailable message, is approximately 30 seconds.
Follow us on TWITTER @VZWSupport If my response answered your question please click the _Correct Answer_ button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!