Table of Contents
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2.2 Screen and display ...................................................................................................................................................... 20
2.2.1 Why do ripples appear on my screen when I press it hard? ..................................................................................... 20
2.2.2 What can I do if my screen is exposed to water? ..................................................................................................... 20
2.2.3 Why does my screen change by itself or automatically open applications? ............................................................ 20
2.2.4 Why does the touchscreen sometimes fail to respond? ............................................................................................ 20
2.2.5 Why does the screen turn off during a call? ............................................................................................................. 20
2.2.6 What can I do if the screen doesn't automatically rotate? ........................................................................................ 20
2.2.7 Why is the touchscreen slow or unresponsive when I use magnification gestures? ................................................ 21
2.2.8 How do I take a screenshot? .................................................................................................................................... 21
2.2.9 Why is my screen sometimes brighter and sometimes darker? ................................................................................ 21
2.2.10 How do I disable auto-rotate? ................................................................................................................................ 22
2.2.11 How do I set a longer screen timeout period? ........................................................................................................ 23
2.2.12 Why does my screen often suddenly freeze and a yellow box appear all around the edges? ................................ 24
twice in a row. Why? ........................................................................................................................................................ 24
3 System functions and settings .................................................................................................. 26
3.1 Why doesn't the Google input method keyboard have number shortcut buttons? ...................................................... 26
3.2 After installing another input method, why can't I use it?........................................................................................... 26
3.3 What can I do if my phone can't automatically adjust its screen brightness? ............................................................. 27
3.4 What can I do if my phone can't automatically rotate its screen? ............................................................................... 27
3.5 Why does the font size remain unchanged after I set it to large? ................................................................................ 27
3.6 Where can I draw the unlock pattern after I turn on the screen? ................................................................................. 27
3.7 How do I hide developer options? .............................................................................................................................. 27
3.8 Why does a blinking red frame appear on my screen? ............................................................................................... 28
3.9 Why can't I find the camera app icon on the home screen? ........................................................................................ 29
3.10 Why is the screen brightness a little darker when I browse a web page? ................................................................. 29
3.11 How do I lock and unlock the screen? ...................................................................................................................... 29
3.12 How do I use Developer options? ............................................................................................................................. 30
3.13 How do I adjust the screen brightness? ..................................................................................................................... 30
3.14 How do I enter or exit safe mode? ............................................................................................................................ 31
3.15 Can I use other chargers than the one provided to charge my phone? ...................................................................... 31
3.16 How can I use the printer function in the settings? ................................................................................................... 31
3.17 How do I enter recovery mode? ................................................................................................................................ 34
3.18 Why can I only zoom in but can't pan when using Magnification gestures? ............................................................ 34
3.19 Does my phone support power-on/off tone? If yes, how do I turn off the power-on/off tone? ................................. 34
3.20 How can I schedule my phone's power-on and power-off time? .............................................................................. 35
3.21 How do I enter USB debugging mode? .................................................................................................................... 35
3.22 What can I do if I can't manually adjust the date and time?...................................................................................... 35
3.23 How do I set the alarm ring length and intervals? .................................................................................................... 36
3.24 Which system sounds can be configured on my phone? ........................................................................................... 37
3.25 How do I view phone information such as the operating system version? ............................................................... 37
3.26 How can I quickly adjust the system volume? .......................................................................................................... 38
April 2015
3
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