In order to hard reset a Telit G83, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Telit G83 device will be brought back to the default configuration of a brand new device.

 

1. Switch on the phone using Power button.

2. Type in any one of these codes: *#3646633# *#94267357# *#19912006# *#77218114# *#118811# *#881188#. Confirm with Call button.

3. Your phone will now reboot. Well done.