618-557 phone numbers

Numbers 618-557-0000 to 618-557-9999 are assigned to Frontier North, Inc. (rate centre HARDINVL, IL, NANPA abbreviation). 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 618-557-1xxx, 618-557-4xxx, 618-557-6xxx, 618-557-8xxx, 618-557-9xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 618-557