45 geselecteerd
- Niet ingevuld
- U.C.N.
- U.N.I.
- U.S. Digitel
- U.S. South
- U.S. Wats
- U.S.South
- UdmurtTelecom
- UK Based Remotes
- Ukrtelecom
- Ultimate Communications
- Un1ca
- Uni 2
- Uni call
- Uni2
- Unica
- Unicall
- Unicard
- Unicom
- UniDial
- Union Telecom Alliance
- Uniphone
- UniqueAir
- Unisource
- United States Postal Service
- United Telecom
- United Telecommunication Services
- Unitel
- Unitel / Unicom
- Universal
- Universal Connections
- Universal Network Services
- Universe
- Universel
- Uno Telecom
- UP & TC
- UPC
- UPC mobile
- Uralsvyazinform
- Urmet
- US South
- US West
- USACard
- USLD
- USWest
- UTI