Mine Battery Drain Issue & hard to get incoming call

Feel like wanna bang steve's head, from world most hi tech gadget turn to worst gadget i ever own. Have to bring charger all the time, really ruin my life.
Even without JB, stock OS 3.0 having same issue. Wth were they doin before release it. Read some info...they even knowing this problem even in BETA.

Any DiGi user here having hard to receive call??Other ppl i upgraded to 3.0 using Celcom have no problem with incoming call.

Regret 3G iPhone User!Help Me before i return back to Bill!