AT&T CL4939 - Manual (Page 40)

34
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 might
be 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 is
calling before you answer the call, even when you
are 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 a 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 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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Caller ID operation