In order to hard reset a Samsung Rex 70 S3802, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung Rex 70 S3802 device will be brought back to the default configuration of a brand new device.
1. Start by turning on the phone by pressing the Power button.
2. Remove your phone's SIM and memory cards.
3. Now enter this code into the phone: *2767*3855#. Confirm it using the Call button
4. Lastly, you may have to input your security phone lock code. The default code is 00000000. Done!