[Primenall]

Here is the Setting for your how often your phone "checks" the towers to see if there is a call for you....less checking=less ring time more checking=more ring time.
I have mine set to 0 (fastest)

To do this, you will need your MSL (6 digit number), which only Sprint (or your provider) can provide you, call and ask or do a search for the program GETSPC, it will also give you your MSL without calling Sptrint for it.

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.