All the phones that are convenient in my house can display Caller ID. I
have taken only to answering those that show an intelligible identity
and not "unknown caller" etc., nor "wireless caller" nor a phone number.

I also have an answering service and I wonder if I am making any
unfortunate mistakes with my policy since any serious caller will leave
a message including ID?
--
Jim Silverton (Potomac, MD)

Extraneous "not." in Reply To.