Βόρεια Αμερική

AT&T (USA)

www.att.com

Bell Atlantic (USA)

http://www.bam.com

MCI (USA)

www.mci.com

Sprint (USA)

www.sprint.com 

SBS (USA)

http://www.sbc.com/

Teleglobe (Canada)

http://www.teleglobe.com/

Νότια Αμερική

Telmex (Mexico)

http://www.telmex.com.mx/

Ευρώπη

British Telecom (Great Britain)

http://www.bt.com/

http://www.btplc.com/

Deutche Telecom (Germany)

http://www.telekom3.de/

France Telecom (France)

http ://www.francetelecom.com/

Telefonica (Spain)

http://www.telefonica.com/

Portugal Telecom (Portugal)

http://www.telecom.pt/uk/

Telia (Sweden)

http://www.telia.se/

KPN (Netherlands)

http://www.kpn.com/

SwissTelecom (Switzerland)

http://swisstelecom.com

TIM (Italy)

http://www.tim.it/

Vodafone (Great Britain)

http://www.vodafone.co.uk/

Belgacom (Belgium)

http://www.belgacom.be/

PTA (Austria)

http://www.pta.at/

Ασία

China Netcom

http://www.cnc.net.cn/english/

China Telecom

www.chinatelecom.com.cn/english/index.html

Chungwa Telecom (Taiwan-China)

http://www.cht.com.tw/

Etisalat (United Arab Emirates)

www.etisalat.com

Hong Kong Telecom

http://www.cwhkt.com/

KDD (Japan)

http://www.kdd.co.jp/

Korea Telecom

http://www.koreatelecom.com/

NTT (Japan)

www.ntt.com

Singapore Telecom (Singapore)

http://www.singtel.com/

STC (Saudi Arabia)

http://www.stc.com.sa/

Ελλάδα 

OTE - Οργανισμός Τηλεπικοινωνιών Ελλάδος

http://www.ote.gr/