Developer Options - Seuic AutoID 9 Manual

7.22 Developer options

Find this icon：
Settings
->
Developer options
->
Go to Settings
for many times and enter the password 4007770876 in the text box when
you are prompted. Developer options then will be enabled and you can
obtain some other information about the device. Developer options can be
found under Settings of all Android devices by default.
Figure 7-54 Accessibility
--> -->
About phone
58
Build number: tap Build number