How to remove Media Net connection?

Originally Posted by coder

I unlocked my Duo so that I can use it on T-Mobile and used SDA_ApplicationUnlock so that I can make registry tweaks and such. Moved my email and attachment storage to the memory card, works great.

I configured T-Mobile data connection under Settings -> Connections -> GPRS, and the selected this new T-Mobile data connection as the default connection under Settings -> Connections -> Advanced.

The problem I am having is that after restarting the phone, the connection I selected under Settings -> Connections -> Advanced returns back to Media Net. Also, if I delete the Media Net connection, it is recreated. So essentially, after each restart, I have to navigate to Settings -> Connections -> Advanced and manually select T-Mobile so that I can connect to the internet again, which is a PITA.

Is there any way to prevent the phone from reverting back to Media Net as teh default connection? Or prevent Media Net connection from coming back after delete and restart of the phone? I thought app unlocking the phone prevents this kind of things from happening?