FIX THE SLOW RINGER
I found the instructions below on another website. I tried it on my 6800 and it worked like a charm. The time it took for my phone to start ringing was cut in half. If you don't have your MSL, you will have to try to get it out of Sprint customer service.
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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