Nokia Lumia 640 User Guide 2 - Page 14

Connect the headset, Antenna locations, special attention to volume levels.

Page 14 highlights

First connect the USB cable to the computer, then to your phone. When the battery is full, first disconnect the USB cable from your phone, then from the computer. The battery can be charged and discharged hundreds of times, but it will eventually wear out. When the talk and standby times are noticeably shorter than normal, replace the battery. Connect the headset Enjoy your favorite music, or free your hands for other things when in a call. The headset may be sold separately. Connect the headset to your phone. Do not connect to products that create an output signal, as this may damage the device. Do not connect any voltage source to the audio connector. If you connect an external device or headset, other than those approved for use with this device, to the audio connector, pay special attention to volume levels. Antenna locations Learn where the antennas are located on your phone to get the best possible performance. Avoid touching the antenna area while the antenna is in use. Contact with antennas affects the communication quality and may reduce battery life due to higher power level during operation. The antenna areas are highlighted. © 2015 Microsoft Mobile. All rights reserved. 14

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First connect the USB cable to the computer, then to your phone. When the battery is
full, first disconnect the USB cable from your phone, then from the computer.
The battery can be charged and discharged hundreds of times, but it will eventually wear out.
When the talk and standby times are noticeably shorter than normal, replace the battery.
Connect the headset
Enjoy your favorite music, or free your hands for other things when in a call.
The headset may be sold separately.
Connect the headset to your phone.
Do not connect to products that create an output signal, as this may damage the device. Do
not connect any voltage source to the audio connector. If you connect an external device or
headset, other than those approved for use with this device, to the audio connector, pay
special attention to volume levels.
Antenna locations
Learn where the antennas are located on your phone to get the best possible performance.
Avoid touching the antenna area while the antenna is in use. Contact with antennas affects
the communication quality and may reduce battery life due to higher power level during
operation.
The antenna areas are highlighted.
© 2015 Microsoft Mobile. All rights reserved.
14