Exchange · San Francisco, CA
(415) 543-xxxx
Every number from 415-543-0000 to 415-543-9999. NANPA records the exchange as assigned to AT&T for San Francisco, CA. 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 415-543
About the 415-543 exchange
415-543 is an exchange (the first six digits of a phone number) in area code 415, which covers California. NANPA, which runs the North American Numbering Plan, assigned it to AT&T for the San Francisco, CA 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 415-543 numbers is usually Pacific time. Scammers can also fake (spoof) any number, so a call that shows a 415-543 number may not come from AT&T at all.