Questions & Answers for: T-Mobile Prepaid master key 4 0

...master reset, follow these steps: Back up all data on the internal memory. You won't be able to since there is no display. Turn off the phone. Press and hold the Power and Volume Up keys ...

...key in again until it powers on to
see if the display is again working.

2 Reset the device if possible. Some phones have an
option to perform a Master Reset using a combination
of ...