The first is probably the simplest — simply go into your phone's settings menu (the icon looks like a silver gear), then tap the "User and backup" or "Backup and reset" option, then finally tap "Factory data reset".
On the newer Galaxy line, such as the Galaxy S5 and onwards, the "Backup and reset" option is located under "USER AND BACKUP" in the Settings menu.
It should be possible to make a backup and reset the PC before releasing it for repair, then restore your system after you get it back.
Return to the Settings menu and select the "Backup & reset" option.
" Navigate to and tap on "Backup and reset.
" If "Backup and reset" isn't an available option in your Settings menu, tap on "Privacy" or "Device Storage".
" Scroll down the Settings menu until you reach the "Personal Header" and locate the "Backup and reset" option.
Android devices – Not as uniform as iOS, but most versions of Android have an erase function either in "Backup and Reset (factory reset)," "Storage" or "Settings/Privacy" — check your device's manufacturer website for information.
From the Settings menu, look for the option called as "Backup & Reset" and click on it.
Enter the Backup and Reset options.
