Nokia 6590 - Manual (Page 21)

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Tips on efficient operation
Your phone has a built-in antenna. As with
any other radio transmitting device, do not
touch the antenna unnecessarily when the
phone is switched on.
Contact with the antenna affects call
quality and may cause the phone to
operate at a higher power level than
otherwise needed.
When you avoid touching
the antenna area during a call, you optimize the antenna
performance and the talktime of your phone.
Normal position: Hold the phone as you would any
other telephone.
IR port
Antenna
Back cover release