Samsung SGH-T959P hard reset, perform a hard reset on Samsung Fascinate 4G is always the last option to solve the devices problems!
Samsung Fascinate 4G(SGH-T959P) was released in Canada in 2011. You are still using the device, but got some problems with your device, now you need to reset your Samsung Fascinate 4G(SGH-T959P) to its factory default settings..
Note A hard reset / master reset will erase all data such as contacts, apps, media files and etc. Please back up your Samsung Fascinate 4G(SGH-T959P) first.
Are you ready to perform a hard reset on Samsung Fascinate 4G SGH-T959P?
Your phone freezes or has fatal errors
If your phone freezes or hangs, you might need to close programs or reset the phone to regain functionality. If your phone is frozen and unresponsive, press and hold  for 8-10 seconds. The phone will reboot automatically.
If this does not solve the problem, perform a factory data reset. In Idle mode, select Applications → Settings → Privacy → Factory data reset → Reset phone → Erase everything
You can find the instructions on how to reset Samsung Fascinate 4G from the device user manual