Sbinger has developed an app “Subscriber Artificial Module (SAM)”which works for PwnageTool or redsn0w hacktivated iPhone 4, iPhone 3GS, iPhone 3G to re-activate the device and fix EDGE/3G over consumption issue leading to hotness and battery drain.
Subscriber Artificial Module (SAM) tricks your iPhone and iTunes into creating legitimate activation tickets even though you’re unlocked with ultrasnow. This means you get the full benefit of push applications, and your battery life increases substantially.