Caller Id Overview - AT&T CL4939 User Manual

Caller ID operation

Caller ID overview

About caller ID
This telephone has a caller ID feature that works
with the caller identification service provided by
your telephone service provider. There is a fee for
this service, and it might not be available in all
areas. This telephone can provide information only
if both you and the caller are in areas offering
caller identification service, and if both telephone
service providers use compatible equipment.
Caller ID with call waiting lets you see who's
calling before you answer the call, even when
you're on another call.
You may need to change your telephone service
to use this feature. Contact your telephone service
provider if:
• You have both caller ID and call waiting, but
as separate services (you may need combined
service).
• You have only caller ID service, or only call
waiting service.
• You don't subscribe to any caller ID or call
waiting service.
You can use this telephone with regular caller ID
service, and you can use this telephone's other
features without subscribing to either caller ID or
combined caller ID with call waiting services.
About home area code and local area codes
Always set your home area code, and if you need
them, up to four local area codes (see Set home
area code on page 19 and Set local area code
on page 19). Entering these area codes changes
how numbers are displayed in the call history and
makes returning a call from the call history easier
(see Returning a call on page 38).
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