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- 1 2 Call
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- 1 telecom
- 2308
- 2Connect by SONY
- 365
- 88 Mobile
- 9 Telecom
- 9278 Distributors, Inc.
- A Telecom
- AAPT
- Abakan
- Abatel
- ABC Stores
- ABN-AMRO
- Absec
- ACC Telekommunikation GmbH (ACC Telecom)
- Access World
- Accos
- Ackermann
- ACS
- ACS Telcom, Inc
- ADDX
- Advanced Business Services
- Advantage Communications Management, Inc.
- Advantel
- Aero LLoyd
- Afghan Wireless
- Afric Phone
- Africa
- Africa 2000
- Africa Access
- Africa News
- Africa Phone
- Africa Titoko
- Africa Way
- Afridylle
- Afrik
- Afro 2000
- Afro Touch 4 You
- AGT
- Aircom
- Airtel
- AIS
- Ajax mobile
- Al-Assadi
- AL-NET
- Albert Heijn
- Albtelecom
- Albtelekom
- Alcatel
- Alcatel Bell
- Alfa 902 Telecom
- Alfatel Telecommunications
- Allianz Arena
- Allo
- Allo Asie
- Allo Chine
- Allworld
- Alpha Telecom GmbH
- Altus
- Amazônia Celular
- AMC Amsterdam
- AmCall/AmCall (IEM)
- Amena
- America First
- American Express
- American Express Telecom Inc.
- American Telecom
- American Telephone & Telegraph Company
- Ameritech
- Ameritech Communications International, Inc.
- AmeriVox
- AmeriVox Benelux
- AmeriVox Transworld
- Amimex
- Amsterdam ArenA
- Anaconda
- ANATEL
- Andusa
- Anritsu
- Antel
- Antel Uruguay
- Antel, Inc.
- ANWB Travelcom
- Any
- ANY phone
- Apelcom
- APG
- Aplab
- Apollo
- Arabel
- Arabtel
- Aras
- ARC
- ARC Networks
- Arena AufSchalke
- Aria
- Arora Telekommunikation GmbH (ATG)
- Arsa Com
- AS Communications
- Asia Love
- Asia Plus
- Asia Telecom SL
- Association des Télécommunications
- AT&T Alascom
- AT&T American Telephone & Telegraph Company
- AT&T Barphone
- AT&T Wireless
- ATI
- ATL
- Atlantic Telecom
- Atlantic Telecom France
- Atlas Telecom
- ATX Telecomminications Service
- Auna
- Auria
- Australia Post
- Australian post
- Australias Phone Card
- Authentic Telecommunications, Inc.
- Avant
- Avantel
- AVE
- Avea
- AVM
- Axalto
- Axis Technologies Solutions (M) Sdn. Bhd.
- AXS Telecom
- AXXON Telecom GmbH
- Ay Cell
- Ay Yildiz
- Azul
- Azultel
- B&B Communications
- B&J Telecard Inc.
- B&M Telecenter
- B&You
- B-Free
- Babsar
- Baby Card
- Bahrain Telecommunications Company
- Bajo Control
- Banana
- Banana Africa
- Bangla
- BankGiroCentrale
- Barak
- BarTel
- Base
- Bashinformsvyaz - Ufa
- Batelco
- Bayan
- BBG communications
- BCTEL Mobility
- Beijing Telecommunications Administration
- Belarus
- BelEuro
- Belgacom
- Bell
- Bell Atlantic
- Bell Canada
- Bell South
- Beller
- Bellsouth
- BelNet
- Beltelecom
- Ben
- Bench Warmer
- Best
- Best Africa
- Best Call
- Best Com
- Best Europe
- Best Line Communications
- Bestcard
- Betkom
- Bezeq
- BH telecom
- Big Bang
- BigCats
- Bing
- Bitag Telecom
- Bite
- BiTEL
- Black Stone
- Black&Yellow
- Blu
- Blue
- Bluedot comms
- BN Telecom
- Bonaire - EZ Talk
- Bonaire - Telbocel
- Bonaire - UTS
- Bonne Année
- Bonsoir Avondsuper
- Boom Boom
- Boost
- Botswana Telecommunications Corporation
- Bouygues Telecom
- Bouygues Telecom SA
- Boxer
- Brasil Telecom
- BraVeTel
- Bravo Technologies
- Bright
- Britisch telecom
- British Airways
- British Telecom
- British Telecom Belgium
- BTC
- BTE
- BTG
- Budget Phone
- BulFon
- Bulgarian Telecommunications Company EAD
- Bull
- Bureau of Telecommunications
- Business Telecom Systems (BTS)
- C.P.I.
- C.S.I.
- C.T.D.
- C3
- C3 - Calling Card Company
- Cable & Wireless
- Cable & Wireless BarTel
- Cable&wireless
- Cabo Verde Telecom
- Calble&wireless
- California Alliance Telecom
- Call Africa
- Call Europe
- Call Home
- Calling Card International
- Callmate Telecom
- CallPlus
- Callpoint
- CallTrak
- Camtel
- Canada Phone Card
- Canada Telecom Network, Inc.
- Canon
- Card Phone Australia
- CardCall International