82 selected
- Not filled in
- Galea
- Gambia Club
- Gamcel
- Gamtel
- GAN telecard
- GE Capital Communication Services
- Gelre Dome
- Gemeentelijk Energie- en Vervoerbedrijf Utrecht
- Gemplus
- General Electric
- General Telecommunication Organization
- General Telecommunications Organization
- General Telecommunications Organizations
- Getesa
- Ghana Telecom
- Gibraltar Nynex Communications
- Gibralter Nynex Communications
- Gibtelecom (GNC)
- GK Group
- Global
- Global Call
- Global Card
- Global Card Services
- Global Card Services Pty Ltd
- Global Com
- Global Commerce & Media Network
- Global Communication Inc.
- Global Communication Networks Inc.
- Global Gossip
- Global Key
- Global Line
- Global Link
- Global Link Teleco Corp.
- Global One
- Global système&network
- Global Tel. Solutions
- Global Telecom
- Global Telecommunication Services GmbH (GTS)
- Global Telecommunication Solutions, Inc.
- Global Telecommunications
- Global World Telecom Europe
- GlobalCard
- Globalline
- GlobalOne
- GlobaTel
- Globe
- GN
- GN Communications
- Gnanam Telecom
- Gnanam Telecom ( Vectone )
- Go
- Go Africa
- Go2
- Gold International
- Gold Line
- Gold Star
- Goldline
- Gosh
- Governatorato città del Vaticano
- GPT
- GPT Payphone Systems
- Grand Canyon Association
- Grand Century Telecom
- Grapes
- Grapevine Telecards
- GRC
- Green
- GRN Group
- Gruppo Telecom Italia
- GT Mobile
- GTE
- GTE Communications Corporation
- GTE Hawaiian telephone
- GTI Telecom, Inc.
- GTN
- GTS
- GTS Belgium
- GTS Global Telecommunication Solutions, Inc.
- Guangdong Posts and Telecommunications
- Guernsey Telecoms
- Guiné Telecom
- Guoxin Telecom