Nokia 808 - Manual (Page 12)

You can use USB charging when a wall outlet is not available. Data can be transferred
while charging the device. The efficiency of USB charging power varies significantly,
and it may take a long time for charging to start and the device to start functioning.
You do not need to charge the battery for a specific length of time, and you can use
the phone while it is charging.
If the battery is completely discharged, it may take several minutes before the
charging indicator is displayed or before any calls can be made.
Switch the phone on or off
Switch on
Press and hold the power key until the phone vibrates.
Switch off
Press and hold the power key .
Lock or unlock the keys and screen
To avoid accidentally making a call when your phone is in your pocket or bag, lock the
keys and screen of your phone.
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