A developer named sbingner has created SAM: Subscriber Artifial Module. SAM fixes all push errors pertaining to hacktivated iphones along with those having battery drain issues with new ultrasn0w unlock.

The Dev Team States:

Developer @sbingner (author of TetherMe) has made some excellent progress devising a new hactivation method that kills two birds with one stone for all you ultrasn0w unlockers.  His tool, “Subscriber Artificial Module (SAM)” tricks your iPhone and iTunes into creating legitimate activation tickets even though you’re unlocked with ultrasn0w. This means you get the full benefit of push applications, and your battery life increases substantially.  If you’d like to try it out, check out http://www.bingner.com/SAM.html

To help make it easier to try out @sbingner’s tool, we’ve updated redsn0w to include a new “Deactivate” option for the 3G and 3GS.  Use this option *after* you’ve installed SAM…it will remove the normal patches made to lockdownd and let SAM take over.  (sbingner plans on making a button to do this within SAMPrefs too).  Great work, @sbingner!

You can Install SAM via iphonespot apps sections if you don’t want to add another repo, on the other hand the original repo to install the original debs is http://repo.bingner.com.

Download Redsn0w .96b6

Windows: http://www.multiupload.com/CMEBKPF1F5

OSX: http://www.multiupload.com/UTJ4GFNNLX