Reverse I.D. - land line in Chicago, IL.
Phone I.D. listed as ATT SVC CNTR.
Went to VM - no message.  

I would think AT&T would be interested in stopping this one.

Just received a call from these scammers pretending to be AT&T. Glad to know the callers are fake but wonder why AT&T doesn't take legal action against these fools? Number now blocked.

INFO FOR ALL INCLUDING ATT:  This number gets to a "Company" website called PRIVACYSTAR, which gives this 312 number, but no address, etc., claims to be selling various phone stuff. Talked to a "Rachel Dickson", probably phony name, who was extremely rude, nasty, hostile, with an arrogant tone, finally told her what she is and hung up!  They use ATTs name, but somehow they know I do get ATTs broadband service--she said she has "important information" about my broadband service, but would never tell me what? They are low-life scammers, and I would not be surprised if ATT accepts the sales  this PrivacyStar outfit gets for them [ATT is generally extremely arrogant in their own rite].

Got a call from this number  312-477-0340 and said my internet service was changed
if I wont my service changed I will call ATT my self.
call from Illinois, Chicago ( scammers). please stop this.

These calls are coming from clowns trying to switch your internet carrier. Remember the long distance "slamming" that was going on years ago? Same thing, only now there's more money in broadband than long distance. Number is blocked.