its called Slot Cycle Index (SCI): how often your phone pings the tower for incoming calls and the instructions on how to do it are in post #2 in this thread
http://forum.ppcgeeks.com/showthread...polling+towers
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)
From that post.
BAF MSL Grabber its a small program that will tell you your MSL its here
http://forum.ppcgeeks.com/showthread...hlight=grabber
I have mine set at 1