I got MMS and Theathering working using the old carrier file. I notice that the battery drain is quick, after 1 call about 10%. My wifes phone was not updated and her battery is fine. Is it possible that the carrier file is causing the drain?
i went ahead and did a full restore and started with a blank slate. I didn't even restore from a backup. Not sure if that was necessary but that worked.
This include the online hack that adds a network profile for tethering? I actually removed mine and I still get the tethering option. Don't know about battery life though.