267 Carriers

Ymax Communcations Corp. - Fl Xo Pennsylvania, Inc.
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.
Sprint Spectrum L P Sprint Communications Company,
Southwestern Bell Mobile Syste Snip Link, L.L.C. - Pa
Service Electric Telephone, In Schuylkill Mobile Fone, Inc.
Sbc Telecom, Inc. - Pa Remi Retail Communications, Ll
Rcn Telecom Svcs Of Philadel D Rcn Telecom Services, Inc. Dba
Rcn Telecom Services Of Pennsy Paetec Communications, Inc. -
Pac-West Telecomm, Inc. - Pa Omnipoint Communications Enter
Nextel Communications, Inc. New Cingular Wireless Pcs
Netcarrier Telecom, Inc. Netcarrier Telecom
Net-Tel Corporation-Pa Metrocall
Mci Worldcom Communications, I Mci Metro Ats, Inc. - Pa
Level 3 Communications, Llc - Leap Wireless Intl
Kmc Telecom V, Inc. - Pa Global Naps South, Inc. - De
Global Naps - Pa Global Crossing Local Services
Ctsi, Llc Core Communications, Inc. - Pa
Comcast Phone Of Pennsylvania, Comcast Phone Of Pennsylvania
Comcast Business Communication Cellco Partnership Dba Verizon
Cccpa, Inc. Dba Connect! Cavalier Telephone, Llc (Mid-A
Cavalier Telephone Mid-Atlanti Broadwing Communications, Llc
Broadview Networks, Inc.-Pa Broadview Networks
Blue Licenses Holding, Llc Bandwidth Com Clec
Atx Telecommunications Service At&T - Local - Pa
Allegiance Telecom Of Pennsylv

267 Exchanges