But also sometimes when they are calling it is going through the server or tower but your device just havent communicated with the tower in a bit so it takes a bit longer to 'find' you and I think you already know this from what you are saying. So I think this is the hack you are looking for. More are listed
here.
Force EV-DO/1X, quicker ring response
To do this, you will need your MSL, which only Sprint (or your provider) can provide you. Verizons cods is 000000 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).
Also on this page is your preferred operation mode. The Default is Automatic, which is the best available mode (EV that will roll back to 1X when EV is unavailable). There are times when you might be in a fringe area and your mode may cycle frequently and this can seriously drain your battery. Setting this to HDR will force EV-DO only if you demand an EV-DO connection. Changing this setting to CDMA Only will force the phone to ignore an EV-DO tower and maintain only a 1xRTT connection.