← Area code 608
608-506 phone numbers
Numbers 608-506-0000 to 608-506-9999 are assigned to Onvoy, LLC in Wonewoc, WI. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 608-506-4xxx, 608-506-5xxx, 608-506-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.