45 selected
- Not filled in
- D 2 Privat Mannesmann
- D1 Telekom
- D1 Victorvox
- D2 Mannesmann Victorvox
- D2 Mannesmann/Vodafone
- D2 Privat
- Dacom
- Daily Card
- Data Communications LTD.
- Dauphin Telecom
- Davidoff
- De danske
- Decatel
- Delight Mobile
- Deltacom Industries Ltd
- Destia
- Deutsche Bundespost
- Deutsche Netzwerk Telefonie GmbH (Dentel)
- Devil
- Dhiraagu
- Dial Asia
- Dial International
- Dial4Cheap
- Diamond Communications
- Die Post
- Dienst Justitiële Inrichtingen
- Dienst Stadstoezicht Amsterdam
- Digi
- Digicel
- Digitec 2000
- Digitel
- Direct Technologies Inc.
- Discount
- Distinct
- DizzoCom
- Djezzy
- Djibouti Telecom SA
- Domodedovo
- Donpi
- Dr. Nassau college
- Dragon
- DSA
- DTSS
- Duocom
- Dynamic TeleCard