WILLIAMSBG — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| AT&T ENTERPRISES, LLC | 516C | 1 |
| ONVOY, LLCV - MI | 543C | 1 |
| MICHIGAN BELL TEL CO | 9323 | 1 |
| BANDWIDTH.COM CLEC, LLC - MI | 991E | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| AT&T ENTERPRISES, LLC | 516C | 1 |
| ONVOY, LLCV - MI | 543C | 1 |
| MICHIGAN BELL TEL CO | 9323 | 1 |
| BANDWIDTH.COM CLEC, LLC - MI | 991E | 1 |