44 selected
- Not filled in
- F net Corp
- F.C. Twente mobiel
- F16
- Face Card
- FairPlus
- Family
- Fast card
- Fast Line Marketing Sdn. Bhd.
- Fastlink
- Faucon Système
- Federated States of Micronesia Telecommunications Corporation
- Fenix
- Fexco
- Feyenoord mobiel
- FHLXW
- Fiji Posts & Telecomminications limited
- FilmNet
- FIN
- Finish Line Racing
- Finnet
- Fintel
- First
- First Telecom
- First:telecom
- Firstcomm
- Fiscal
- Florida Telecom
- Florijn college
- Fone Connect
- FonecardKuwait
- Fonezy
- France Telecom
- France Telecom Mobiles
- Free
- Freecom
- Freedom
- Frog
- Frontier
- Frontier Communications International Inc.
- Fujian Posts & Telecommunications Administration
- Fujian Telecom Co., Ltd.
- Full Time
- Future Call Company
- Fyns Telefon