Huawei Ascend Y550 - Phone settings; Turning aeroplane mode on or off; Adjusting the screen brightness

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Phone settings
Turning aeroplane mode on or off
Your phone's signal may interfere with an aeroplane's flight systems.
When you are aboard an aeroplane, turn off your phone or switch it to
aeroplane mode. In aeroplane mode, your phone's wireless features are
disabled, but you can still listen to music or play games.
Use either of the following methods to turn
Aeroplane mode on or off:
• Press and hold the power button, and touch Aeroplane mode .
• On the home screen, touch . Under All , touch Aeroplane mode .
When aeroplane mode is on, is displayed on the status bar.
Adjusting the screen brightness
1. On the home screen, touch .
2. Under All , touch Display .
3. Touch Brightness .
4. Drag the slider left or right to adjust the screen brightness.
You can also flick down from the status bar to open the notification
panel and adjust the screen brightness using the shortcut switch.
Modifying tone settings
1. On the home screen, touch .
2. Under All , touch Sound .
3. On the Sound screen, you can: