Your device may have internal and external antennas.
Avoid touching the antenna area unnecessarily while
the antenna is transmitting or receiving. Contact with
antennas affects the communication quality and may
cause a higher power level during operation and may
reduce the battery life.
— Bluetooth and wireless LAN (WLAN), and GPS
— FM transmitter antenna
— Cellular antenna
The FM transmitter antenna is located in the back cover
of your device. If you change the back cover, check that
the new cover includes this antenna, otherwise this
connection stops working. Bluetooth, WLAN, and GPS
antennas are located at the back of your device.