Update to the iOS7

my iPhone has already been unlocked and put on to metropcsnetwork , if i do the update to the iOS7, will my phone lock back up & will I have to have the phone unlocked again ?

Try the following: Settings > General > Reset > Reset All Settings & Reset Network Settings
This deletes all of your preference settings, returning them to the defaults. It will not erase any of your data or apps.
The Reset Network Settings will forget your Wi-Fi connection and password
Also it would be important to know if your are using SMS or iMessage when texting and/or sending Pictures.
Hope this helps.

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