[AC Question]

Last week, I got a screen announcing a software update for my T Mobile Galaxy 5.
It was mandatory. When it was finished loading..
My Facebook was unable to let me in or adjust it. I now get screens to sign in where they did not exist prior. Formats of some programs have changed and the phone is slower in every way.

What the hell happened here? I live in the Philadelphia area and this has disrupted many people I know. I don;t think this can be recinded, so am I stuck or do I try another carrier??