Nokia 6820i User Manual page 20

Phone setup
TIPS ON EFFICIENT OPERATION: Your phone has a
built-in antenna. As with any other radio transmitting
device, do not touch the antenna area 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.
Not touching the antenna area during a phone call
optimizes the antenna performance and the talk time
of your phone.
Nokia 6820i User Guide 11 Copyright © 2004 Nokia