it has to do with your SCI (slot cycle index)
I have sprint PPC6800 so I'm only familiar with how to do this on that, not a Verizon PPC6700 (if it's any different)
Quote:
19-FIX THE SLOW RINGER
To do this, you will need your MSL, which only Sprint (or your provider) can provide you. Open up the phone app and dial ##778# (PST). You will be asked to enter your MSL. Enter it, and you will be brought into the provisioning of your phone. From the top left, select Modem Settings. On this page, your Slot Cycle Index (SCI) is how often your phone polls the tower for incoming calls, etc. This value is 1.28 seconds multiplied by 2^value (i.e 0=1.28 secs, 1=2.56secs) with 0 fastest, 7 slowest. The default is 2, but lowering it to 1 hasn't noticeably affected my battery life, and roughly 2.5 second (SCI 1) response time is far more reasonable than roughly 5 seconds (SCI 2)
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http://forum.ppcgeeks.com/showthread.php?t=5108