HTC 6900 User Manual page 188

188 Managing Your Device
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Turn Bluetooth off when you are not using it. Make your device visible
to other devices only when you are trying to establish a Bluetooth
partnership. For more information about Bluetooth, see Chapter 10.
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Lower the volume.
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Close battery-intensive programs, such as the Camera, when you are
done using them. Make sure the programs are ended and are not
continuously running in the background.