http://www.att.com
2. Verizon
http://www.verizon.com
3. SBC
http://www.sbc.com
4. MCI
http://www.mci.com
5. British Telecom
http://www.bt.com
6. Bell South
http://www.bellsouth.com
7. Bell Atlantic
http://www.bellatlantic.com
8. Qwest
http://www.qwest.com
9. Sprint
http://www.sprint.com
10. NTT
http://www.ntt.com