Had no battery issues after jailbreaking 3.0 with Pwnage. However, battery life is draining 3x faster now after unlocking with Ultrasn0w. Edge signal strength (T-Mobile USA) is also weaker on the iPhone as to compared to the reception from using the same SIM card on a Sidekick. Have tried all of the suggested solutions floating online to no avail. Push notifications do work via activating with an AT&T SIM.