Yes, all smartphones and feature phones YEZZ are unlocked from factory and compatible with GSM networks (2G) with any carrier. For 3G and 4G networks you should check with your carrier and verify that the bands are compatible.

Global system for Mobile Communications (GSM), is the most extensive standard in the world, with 82% of its worldwide terminals active and in use. GSM has more than 5 billion users in 212 different countries, being the predominant standard in Europe, South America, Asia and North America.

This term is used to define the cell phones that use GSM frequencies 850, 900, 1800 and 1900 Mhz.

To enable USB debugging you must first enable the developer mode by following these steps: Go to Applications Menu > Settings > About phone > tap “Build Number” multiple times until you see the message "You are now developer" on the bottom. Return to the main “Settings” menu > Go in “Developer Options” > Check the USB debugging option.

To activate this feature, you must first have configured an Internet connection with your carrier and then you can follow the steps below: Go to the “Applications Menu” > “Settings” > “More” > “Tethering & portable hotspot” > “Wi-Fi hotspot” to activate the service.

You can remove all the configurations, files and applications from your phone doing a Factory Reset following these steps: Go to the “Applications menu” > “Settings” > “Backup & reset” > “Factory data reset”