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← Area code 231

231-440 phone numbers

Numbers 231-440-0000 to 231-440-9999 are assigned to 123.net, LLC in Baldwin, MI. 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-440-5xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-440