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components of the mobile phone.
The mobile phone provides the following keys:
Power key situates at the right side of the phone. While using the phone, you can press this key to lock
screen; if you press and hold this key, a phone-options dialog would pop out. Here, you can select to power
on/off, restart and turn on/off airplane mode.
Volume key situates at the upper side of the power key. You can press it to adjust ring volume.