Do you use gevey card? If you do then you know there is a procedure that you must do before connecting it to your mobile operator network. Sometimes when 3G signal is weak, it gets confused and loses network coverage. At that point it loses gevey activation. After that you have to restart your phone and do the activation procedure all over again. Maybe if there was some tweak that can spoof fake signal to iPhone it wouldn't lose gevey activation and iPhone wouldn't have to be restarted and wouldn't have to go through gevey activation procedure all over again. Hope this clears my question a little.