← Area code 305
305-583 phone numbers
Numbers 305-583-0000 to 305-583-9999 are assigned to Onvoy, LLC (rate centre NORTH DADE, FL, NANPA abbreviation).
Not assigned to any carrier: 305-583-4xxx, 305-583-5xxx, 305-583-6xxx, 305-583-7xxx, 305-583-8xxx, 305-583-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.