Exchange · Chicago, IL
(773) 553-xxxx
Every number from 773-553-0000 to 773-553-9999. NANPA records the exchange as assigned to AT&T for Chicago, IL. Robocall and scam operations often use many numbers from one exchange, so if one number here is a shady call, its neighbors deserve a second look.
Reported numbers starting 773-553
About the 773-553 exchange
773-553 is an exchange (the first six digits of a phone number) in area code 773, which covers Illinois. NANPA, which runs the North American Numbering Plan, assigned it to AT&T for the Chicago, IL rate center. Numbers from this carrier are usually landline lines.
People keep their number when they move or switch carrier, so this is where the number was first assigned, not where the caller is today. Local time for 773-553 numbers is usually Central time. Scammers can also fake (spoof) any number, so a call that shows a 773-553 number may not come from AT&T at all.