Im no ios expert but from what I have picked up is whenever there is a change in the .prl file or carrier files you toggle all the push flags to the on position, or if your using ifile toggle it on or if your using plist editor make it read true and reset the phone and its suppose to make the phone recognize the new settings or .prl file. its kind of like a wake up call for the phone to let it know about the changes in the carrier bundles and apply the new settings to where they need to go but as you may already know after the reboot with the push flag on dont forget to toggle them back off and reboot. I know this was kind of a stupid reply but im no developer its just from things I picked up here and there.
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