ZTE Grand X Plus - Manual (Page 164)

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Printing
You can install printer plug-ins from the Google Play Store or
your printer manufacturer and configure cloud printing service
options, manage print jobs and more.
Developer Options
Developer options contains settings that are useful when
developing Android applications. The menu is hidden until you
touch Build Number in the About phone menu 7 times.
WARNING!
The developer option settings are intended for development
use only. They can cause your phone and applications on it to
break or misbehave.
About Phone
View phone status, legal information and other information. You
can also upgrade your phone system.