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3.  Disconnect the charger when the battery is fully charged. 
  NOTE: 
If the battery is extremely low, you may be unable to power on 
the phone even when it is being charged. In this case, try again 
after charging the phone for at least 20 minutes. Contact the 
customer service if you still cannot power on the phone after 
prolonged charging. 
Powering On/Off 
  Press and hold the Power key to turn on your phone. 
  To power off, press and hold the Power key to open the 
options menu, and touch    >  . 
  NOTE: 
If the screen freezes or takes too long to respond, try pressing 
and holding the Power key for about 10 seconds to restart the 
phone. 
Setting Up for the First Time 
When you first power on your phone after you purchase it or 
reset it to factory settings, you need to do some settings before 
using it.   
Select the language field and follow the on-screen prompts to set 
up your phone.