Reset Network Settings
You can reset

Factory Data Reset
You can reset your device to factory defaults, erasing all data from your device.
This action permanently erases ALL data from the device, including Google or other account settings, system and application data and settings, downloaded applications, as well as your music, photos, videos, and other files. Any data stored on an external SD card is not affected.
To reset your device:1.From a Home screen, tap

Settings | 109 | Backup and Reset |
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