Area Code — 779

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Rate centers: ROCKFORD, GALENA, CRYSTAL LK, SYCAMORE, OGLESBY, JOLIET, WILMINGTON, CRESCENTCY, KANKAKEE, STERLING, FRANKFORT, NEWMILFORD, GENOA, DE KALB, SHEFFIELD, WONDERLAKE, SO BELOIT, MANTENO, MT MORRIS, MARENGO, BELVIDERE, DIXON, NEWARK

Companies: CELLCO PARTNERSHIP DBA VERIZON WIRELESS, LEVEL 3 COMMUNICATIONS, LLC, NEW CINGULAR WIRELESS PCS, LLC, YMAX COMMUNICATIONS CORP., SPRINT SPECTRUM L.P., SBC INTERNET SERVICES, INC., MEDIACOM TELEPHONY OF ILLINOIS, LLC, BANDWIDTH.COM CLEC, LLC, OVATION COMMUNICATIONS OF ILLINOIS, INC., INFOTELECOM, LLC, TDS METROCOM INC., CYGNUS TELECOMMUNICATIONS CORPORATION, TELEPORT COMMUNICATIONS GROUP - CHICAGO, BROADWING COMMUNICATIONS, LLC, US XCHANGE OF ILLINOIS LLC DBA CHOICE ONE COMM IL, IOWA WIRELESS SERVICES, LP, DENALI SPECTRUM LICENSE, LLC, COMCAST PHONE OF ILLINOIS, LLC DBA COMCO, MCI WORLDCOM COMMUNICATIONS, INC., CHARTER FIBERLINKLINOIS, LLC, PEERLESS NETWORK OF ILLINOIS, LLC, MTCO COMMUNICATIONS, INC., AMERITECH ILLINOIS, PAETEC COMMUNICATIONS, INC., T-MOBILE USA, INC., DIGITAL NETWORK ACCESS COMMUNICATIONS, INC., MCLEODUSA TELECOMMUNICATIONS SERVICES, INC.

List of 779 Area-Code Phone Number Prefixes

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