Ok - here are my tests on a stock Sprint ROM:
1) Call answer:
*** from sleep mode & awake mode:
>> NO to answer call with phone button on 1st try
>> YES to subsequent tries with button & with slider on screen
2) Call Answer with browser on:
>> NO to answer call with phone button on 1st try
>> YES to subsequent tries with button & with slider on screen!!
>> LOST data connection in some instances!!
3) Observing data connection arrows in taskbar icons:
>> 1 min - still connected after activity
>> 2 min - still connected after activity
>> 5 min - still connected after activity
>> Forced Sleep - disconnected
4) Observing data connection arrows in taskbar icons after forced sleep:
>> UNABLE TO CONNECT to mail services
>> UNABLE TO CONNECT to weather manual update
>> UNABLE TO CONNECT Opera
>> #777 unable to dial popup on all occasion
So from my test - it appears when that the TP2 has trouble reconnecting instantaneously after a prolonged inactivity period but once out of it's hibernation it's acts as the cab intended - turning off data connection after activity & answer calls when needed.
this is unacceptable on my part esp. knowing the importance of email to me.
UPDATE:
All of my problems above were solved with this cab
HERE
or
THIS.
You should read the background before instituting the fix.
Hope this helps some1 trying to save some battery.