Sum how i managed to turn on developer options. And that's all I did. I never messed with settings or downloaded anything that would effect the OS. a week after the developer options were turned on. My phone kept rebooting over and over. It would get stuck on the tmobil logo for a very long time. Then I got a notice that said your device has been corrupted it cannot be trusted visit this link from another device g.co/abh. Then it tuned off and never went on again. Does absolutely nothing.