Nokia 2690 - Manual (Page 11)

3 When the device indicates a full charge, disconnect the
charger from the device, then from the wall outlet.
You do not need to charge the battery for a specific length
of time, and you can use the device while it is charging. If
the battery is completely discharged, it may take several
minutes before the charging indicator appears on the
display or before any calls can be made.
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.
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