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Inserting them in a wrong direction may cause charging failure or
other problems. Before the charging, ensure that the standard
voltage and frequency of the local mains supply match the rated
voltage and power of the travel charger
Optimizing battery life
You can extend your battery’s life between charges by turning off
features that you don’t need. You can also monitor how
applications and system resources consume battery power.
To guarantee the optimal performance of your battery, please
stick to the following rules:
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Bluetooth, or GPRS, use the Setting application to turn them off.
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Calendar, Contacts, and other applications.
Note: On the Home screen, press Menu icon and touch Settings
> About phone > Battery use. The Battery Use screen lists the
applications that have been using the battery, from greatest to
least battery use. The top of the screen displays the time since
you were last connected to a charger or, if you
，re currently
connected to one, how long you were running on battery power
before you connected to a charger Then each application or
service that used battery power during that time is displayed, in
order of the amount of power they used. Touch an application in
the Battery Use screen to learn details about its power
consumption. Different applications offer different kinds of
information.
3.3 Linking to the Networks and devices
Your phone can connect to a variety of networks and devices,
including mobile networks for voice and data transmission, Wi-Fi
data networks, and Bluetooth devices, such as headsets. You
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