- Dharmatel Telecom Services
 - Providing direct phonecalls and callback services. - Efficiente Communicatie Componenten BV
- Providers of lightweight headsets.
- Energis NL
- KPN
- Core business areas include fixed telephony, mobile communications, data communication services and Internet, call centre and media services.
- Quinsy
- Specialised in the development of wireless datacommunication middleware and wireless data application products.
- RAM Mobile Data
- Simyo
- Simyo is KPN's online mobile brand in The Netherlands, Germany, Belgium, France, and Spain. We provide simple, no-frills prepaid services at affordable cost through Internet.
- Telfort BV
- Complete telecommunicatie oplossingen voor mobiele en vaste, nationale en internationale, data en spraak diensten.
- Vanga Europe
- Manufacturers and suppliers of connection products for telecom and data applications.
- VersaTel Telecom
- Dutch telecom company with local access fibre optic cable across Europe and international connectivity.
- WorldCom Netherlands
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