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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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| 857 | 299 | BELMONT | Massachusetts | ONVOY, LLC - MA |  | |
The Massachusetts agency which regulates phone companies is on the web: Here
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VOIP - Voice Over Internet Protocol - Facts and Updates |
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