曾经的巨无霸美国电话电报公司在1984年被分成7块后，几经分分合合，终于又坐回江
湖霸主的宝座。
* Ameritech — (acquired by SBC in 1999 - now part of the new AT&T)
* Bell Atlantic — (acquired GTE in 2000 and changed its name to Verizon)
* BellSouth — (acquired by AT&T Inc. in 2006)
* NYNEX — (acquired by Bell Atlantic in 1996 - now part of Verizon)
* Pacific Telesis — (acquired by SBC in 1997 - now part of the new AT&T)
* Southwestern Bell — (changed its name to SBC in 1995; acquired AT&T
Corp. in 2005 and changed its name to AT&T Inc.)
* U S West — (acquired by Qwest in 2000)
