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Phone numbers, along with owner names and location information, found in U.S. open datasets:
Prefix 312-812 is operated by ILLINOIS BELL TEL CO. Its rate center is CHICGOZN01.
| Company | ILLINOIS BELL TEL CO |
| Rate Center | CHICGOZN01 |
Other prefixes with the same CHICGOZN01 rate center and operated by ILLINOIS BELL TEL CO: