Instructions to pin screen on Gfen devices

How to protect your privacy when lending a Gfen smartphone or tablet to someone else. Instructions for setting up "screen pinning" on a Gfen brand device. Block an application on the screen from which the user will not be able to exit without knowing the unlock pin, in this way you will prevent them from seeing your messages, photos and private data that you do not want to show.

Gfen N37 Gfen N37
Gfen N29 Gfen N29
Gfen Mini N4 Gfen Mini N4
Gfen GFen D9800 Gfen GFen D9800