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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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| 605 | 541 | BIGSTONECY | South Dakota | MIDCONTINENT COMMUNICATIONS. - SD | CLEC |  |
The South Dakota agency which regulates phone companies is on the web: Here
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