ZTE ZMAX - Manual (Page 30)

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Touch Face Unlock to let the phone capture your face. You can
unlock the screen by looking at the front camera. You also need
to set a pattern or PIN in case the phone cannot recognize your
face.
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If you touch Pattern, you’re guided to create a pattern you must
draw to unlock the screen. The first time you do this, a short
tutorial about creating an unlock pattern appears. Then you’re
prompted to draw and redraw your own pattern.
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If you touch PIN or Password, you’re prompted to set a numeric
PIN or a password you must enter to unlock your screen.
IMPORTANT: Screen lock options are listed in the approximate order of
the strength of their security, starting with
None and Long press, which
provide no security. A pattern provides minimal security, although it can
be more convenient than the stronger options.
Protecting Your Phone With Encryption
You can encrypt all the data on your phone: Google Accounts, application
data, music and other media, downloaded information, and so on. If you
do, you must enter a numeric PIN or password each time you power on
your phone.