Nokia 2720 - Manual (Page 9)

Antenna
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.
The figure shows the antenna area marked in grey.
Headset
Warning:
When you use the headset, your ability to hear outside
sounds may be affected. Do not use the headset where it
can endanger your safety.
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