T-Mobile Concord II User Manual page 127

Problem
Echo or noise
Unable to select
certain features
Battery not
charging
Possible causes
Poor network link quality on the
part of your service provider.
Poor local telephone line quality.
Your service provider does not
support these features, or you
have not applied for services that
provide these features.
The battery or battery charger is
damaged.
The phone's temperature is below
0°C or higher than 4 °C.
Poor contact between the battery
and charger.
End the call and dial again.
You may be switched to a
better-quality network link
or phone line.
End the call and dial again.
You may be switched to a
better-quality network link
or phone line.
Contact your service
provider.
Contact the dealer.
Adjust the battery charging
environment to avoid
extremes of temperature.
Check all connectors to
make sure all connections
have been properly made.

Possible solution