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Reset My Samsung Galaxy S3

Reset My Samsung Galaxy S3 ( T999, i747, i535, i9305, sgs3, LTE GT-i9305, unlock gs3, i9300 )

Step 1:
Make a backup. Be aware you may lose data in the process of resetting your mobile device.

Step 2:

Turn the Samsung Galaxy S3 off. If necessary pull the battery out and reinsert it.
Hold the volume up button and home button.
Press and release the power button.
The Samsung Galaxy S3 will show a menu
Select Factory reset by pressing the volume down button
Press and release the power button
Confirm with volume up

Huawei

Nokia