How to Hard Reset Samsung Android Phone

1. When the phone is powered off, press and hold the Volume Up and the home button keys both at the same time, then press and hold the Power key until a test screen that shows some available options appears.

Press the Volume Down key to navigate down through the options until it highlights FACTORY RESET then press the Power key to select it.


Unfortunately the process com.android.phone has stopped error fix

many tutorials said to update the rom , hard reset, wipe cache or factory reset .yous you can do that but if you care about your data just check this two steps first
1- Settings>Application Manager> Menu > Reset app preference>Reboot
2-try with other sim card if this error come again some time it is sim card problem