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| Area Code | Prefix | City/Switch Name (Click for city search) | State/Prov. Area Map | Telephone Company Web link | Telco Type | Map/Zip Detail |
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| 517 | 820 | EAST TAWAS | Michigan | NPI WIRELESS, A DIVISION OF NOVERR PUBLISHING INC | PCS |  |
The Michigan agency which regulates phone companies is on the web: Here
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VOIP - Voice Over Internet Protocol - Facts and Updates |
Get the Facts - Wireless/Local Number Portability - and Updates
WIMax - Worldwide Interoperability for Microwave Access - News and Products |