Connect The Headset; Antenna Locations - Microsoft Lumia 640 User Manual

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.
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