HARTFORD — MI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER NORTH, INC. - MI | 0695 | 1 |
| COMCAST IP PHONE, LLC | 318J | 1 |
| INTERACTIVE SERVICES NETWORK, INC. | 4632 | 1 |
| INTERACTIVE SERVICES NETWORK, INC. | 817J | 1 |
| FRACTEL, LLC | 965H | 1 |