- Apollo Telco Communications
- Arbinet-Thexchange
- Arbinet-Thexchange
- Arbos Communications Inc
- Arbros Communications Inc
- Arcadia Telephone
- Arcadia Telephone Cooperative
- Arch Communications Inc
- Archie Affordable Phone Svc
- Arctic Slope Telecommunication
- Ardmore Telephone Co
- Ardmore Telephone Co
- Ardmore Telephone Co
- Ardmore Telephone Co Repair
- Ardon Communication
- Ardon Communication
- Argonetics Inc
- Aria Communications
- Arizona Dialtone
- Ark Telecommunications Inc
- Arkansas Telephone Co
- Arko Telephone Of Springdale
- Arkwest Communications
- Arlington HS Telephone System
- Armstrong Internet
- Armstrong Telephone Co
- Arriso Networks Inc
- Arrival Communications
- Arrival Communications
- Arthur Mutual Telephone Co
- Artshow Amherst
- Arvig Communication System
- Arvig Communication Systems
- Arvig Communicatios Systems
- ASC Telecom LP USA
- Ascinsa Corp
- Asheville Arms Pool Telephone
- Asia Access Telecom
- Asia Access Telecom
- Asia Communications Intl
- Asiana Telecom
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- Asiana Telecom
- Asiana Telecom
- Asiana Telecom
- Aspect Communications
- Aspect Software Inc
- Aspire Telecom Inc
- Assist Phone Intl Inc
- Associated Telecom Inc
- Associated Telephone
- Associated Telephone
- Association Of Independent
- Association Of Independent
- Astound Cable TV & Telephone
- At & T Cits
- At & T Cits
- At & T Global Network
- At & T Global Network Svc
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- At & T Voice
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- At Envios Corp
- At Light Speed
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- At T Local Svc Cage
- At& T Cits
- At&T Cits
- At&T Cits
- AT&T Co
- At&T Telephone Pioneers
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- AT&T.Com
- Atacomm
- Atar Twin Media
- Atc
- ATC Communications
- ATC Communications
- ATG Corporate
- Athena Operator & Data Svc
- Atheros Communications Inc
- ATI Alternative Telecomm
- ATI Phone Ctr
- Atkins Telephone Co
- Atlantic Diversified Techs Inc
- Atlantic Telecom
- Atlantic Telecommunications
- Atlantic Telecommunications
- Atlantic Telephone Co
- Atlantic Telephone Co
- Atlantic Telephone Membership
- Atlas Telephone Co
- ATMC Inc
- Atomus Telecom
- ATS Communications
- ATS Telecommunication Systs
- ATS Telecommunications Syts
- ATSI Communications Inc
- ATSI Communications Inc
- ATT Conference Ctr
- ATT Heritage Park
- ATT Solutions
- ATT Voice
- Attis
- ATX Communications Inc
- ATX Communications Inc
- ATX Communications Inc
- ATX Communications Inc
- ATX Communications Inc
- ATX Communications Inc
- ATX Telecomm MD Dip
- ATX Telecommunications
- ATX Telecommunications
- Aubeta Networks
- Aubeta Networks
- Audio F/X By Dayton Wireless
- Austin Telecom Ventures Inc
- Automated Phone Line
- Avalanche Communications
- Avalanche Communications
- Avalon Building Systems
- Avare Solutions
- Avatel Tech
- Avaya Inc
- Avaya Inc
- Avaya Inc
- Avaya Telephone Svc
- Avera Communication LLC
- Aversa Communications
- Avix Telecom
- Avvid Communications
- Avvid Technologies
- Ax Telecommunications
- Axes Technologies Inc
- Axxis Communications
- Ayersville Telephone Co
- Ayrshire Farmers Mutual Co
- B & B Communications Inc
- B & C Telephone Co
- B & W Tek
- B B & W Telephone Repair Svc
- B H Godwin
- B R Consultants
- B T
- B T Americas Inc
- B T North America Inc
- B2B Communications
- Bailey Shop Phone
- Ballard Rural Telephone
- Bandwidth Exchange Buildings
- Baraga Telephone Co
- Baraga Telephone Co
- Barnes City Telephone Co
- Barracks Phone
- Barracks Phone Svc
- Barracks Phone Svc
- Barry County Telephone Co
- Bartel Communications
- Basi Phone Inc
- Basic Access Communications
- Basic Phone
- Basic Phone Inc
- Basic Phone Inc
- Basic Phone Inc
- Basicphone
- Basicphone
- Basicphone Inc
- Basicphone Inc
- Basset Telecom Voice Mail
- Basset Telecom Voice Mail
- Bastow Telecom Line
- Bay Ring Communications
- Bay Springs Telephone Co
- Bay Springs Telephone Co
- Bay Springs Telephone Co
- Bay Springs Telephone Co Inc
- Bayland
- Bayou Telephone Co
- Bayring Communications
- Bayshore Telephone Systems
- BBC Telephone Inc
- BCE Nevada
- BCE Nexxia Corp Inc
- BCE Nexxia Corp Inc
- BCN Telecom Inc
- Bear Lake Communications
- Bear Lake Communications Inc
- BEAVER Creek Telephone
- Bee Line Long Distance Inc
- Beehive Telephone
- Beehive Telephone
- Beehive Telephone Co
- Beehive Telephone Co
- Beepeers Lionel
- Beggs Telephone Co
- Bell Atlanticom Systems Inc
- Bell Canada
- Bell Nexxia
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- Bell South
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