T-Mobile SDA hard reset

Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media.

Restarting your Phone

Occasionally, you may want to restart your phone, for
example, when a program is not performing properly or the
phone does not respond to any keypresses.

To restart the phone

1. Remove the battery.
2. Reinsert the battery and turn on your phone.
If the phone is restarted while a program is running, unsaved work
will be lost.

Resetting your Phone

Resetting your phone will remove all the data from the
its memory which include contacts, tasks, calendar
appointments, and more, and restore the phone back to the
factory default settings.

To reset your phone

1. Click Start > More > More > Accessories > Clear
Storage.
2. Follow the on-screen instructions to reset the phone.
The phone will restart after it has been reset.