484 Carriers

Xo Pennsylvania, Inc. Xo Pennsylvania
Verizon Pennsylvania, Inc. Verizon Pennsylvania, Inc - P
Us Lec Of Pennsylvania, Inc. Telcove Of Eastern Pennsylvani
Tcg Delaware Valley, Inc. - Pa Sprint Spectrum L.P.- Pa
Sprint Spectrum L.P. Sprint Spectrum L P
Sprint Communications Company, Southwestern Bell Mobile Syste
Snip Link, L.L.C. - Pa Service Electric Telephone, In
Service Electric Telephone Sbc Telecom, Inc. - Pa
Rcn Telecom Svcs Of Philadel D Rcn Telecom Services, Inc. Dba
Rcn Telecom Services Of Pennsy Peerless Network Of Pennsylvan
Paetec Communications, Inc. - Pac-West Telecomm, Inc. - Pa
Omnipoint Communications Enter Nextel Communications, Inc.
Nextel Communications New Cingular Wireless Pcs
Metrocall Mci Worldcom Communications, I
Mci Metro Ats, Inc. - Pa Level 3 Communications, Llc -
Keystone Wireless, Llc Ironton Tel Co
Global Naps - Pa Global Crossing Local Services
D&E/Omnipoint Wireless Joint V Ctsi, Llc
Ctc Communications Corp. - Pa Commpartners, Llc - Pa
Commonwealth Telephone Company Comcast Phone Of Pennsylvania,
Comcast Phone Of Pennsylvania Comcast Business Communication
Choice One Communications, Inc Cellco Partnership Dba Verizon
Cei Networks, Inc. - Pa Cccpa, Inc. Dba Connect!
Cavalier Telephone, Llc (Mid-A Cavalier Telephone Mid-Atlanti
Broadwing Communications, Llc Broadview Networks, Inc.-Pa
Blue Licenses Holding, Llc Atx Telecommunications Service
At&T - Local - Pa Allegiance Telecom Of Pennsylv

484 Exchanges