AT&T公司(si)（英語(yu)：AT&T Inc.，原為American Telephone & Telegraph的縮寫，也(ye)是(shi)(shi)中文譯名美(mei)國電(dian)話電(dian)報公司(si)由來，但近(jin)年(nian)來已不(bu)用全(quan)名），是(shi)(shi)一家美(mei)國電(dian)信公司(si)，創建于1877年(nian)。 AT&T在(zai)近(jin)120年(nian)中，曾(ceng)經過(guo)多次分(fen)拆和重(zhong)組(zu)。 AT&T也(ye)是(shi)(shi)是(shi)(shi)美(mei)國NBA聯盟圣安東(dong)尼奧馬刺(ci)的球館英語(yu)名AT&T Center。

美(mei)國(guo)電(dian)(dian)(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)(dian)(dian)報公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)有8個主要(yao)部門 ：貝(bei)(bei)(bei)(bei)爾(er)(er)(er)實驗室(shi)、商業市場(chang)集團(tuan)、數(shu)據系(xi)(xi)統公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si) 、通用(yong)市場(chang)集團(tuan) 、網(wang)絡運營集團(tuan)、網(wang)絡系(xi)(xi)統集團(tuan)、技術系(xi)(xi)統集團(tuan)、公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)國(guo)際集團(tuan)。主要(yao)業務(wu)(wu)(wu)(wu)(wu)是(shi)：為國(guo)內國(guo)際提供(gong)電(dian)(dian)(dian)(dian)(dian)話(hua)服務(wu)(wu)(wu)(wu)(wu)。利(li)用(yong)海底電(dian)(dian)(dian)(dian)(dian)纜、海底光纜、通信衛星，可聯系(xi)(xi)250個國(guo)家和(he)(he)地(di)(di)區，147個國(guo)家和(he)(he)地(di)(di)區可直(zhi)接撥號。提供(gong)商業機(ji)器(qi)、數(shu)據類產(chan)品(pin)和(he)(he)消費(fei)類產(chan)品(pin)。提供(gong)電(dian)(dian)(dian)(dian)(dian)信網(wang)絡系(xi)(xi)統。各種服務(wu)(wu)(wu)(wu)(wu)及租賃業務(wu)(wu)(wu)(wu)(wu)。它還為政(zheng)府(fu)提供(gong)產(chan)品(pin)和(he)(he)服務(wu)(wu)(wu)(wu)(wu)。該(gai)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)非(fei)常重視科(ke)研和(he)(he)開發(fa)新(xin)產(chan)品(pin)。美(mei)國(guo)電(dian)(dian)(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)(dian)(dian)報公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)在泰國(guo)、德國(guo)、新(xin)加(jia)坡等地(di)(di)設(she)有工(gong)廠(chang)。在意大利(li)、韓國(guo)、日本等國(guo)設(she)有子公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)或者合資公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)。1995年(nian)9月，該(gai)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)解(jie)體為三個獨立的(de)(de)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)：通訊(xun)服務(wu)(wu)(wu)(wu)(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、通訊(xun)設(she)備公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、電(dian)(dian)(dian)(dian)(dian)腦(nao)信息服務(wu)(wu)(wu)(wu)(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)，并(bing)且(qie)退出(chu)個人電(dian)(dian)(dian)(dian)(dian)腦(nao)領域。AT&T的(de)(de)瓦(wa)解(jie)過程開始于1984年(nian)。在美(mei)國(guo)政(zheng)府(fu)反壟斷政(zheng)策(ce)的(de)(de)強制(zhi)干預(yu)下，公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)的(de)(de)本地(di)(di)電(dian)(dian)(dian)(dian)(dian)話(hua)業務(wu)(wu)(wu)(wu)(wu)被(bei)分裂出(chu)去，重新(xin)組建了7個子公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)，分別(bie)是(shi)：貝(bei)(bei)(bei)(bei)爾(er)(er)(er)太平(ping)洋公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、Ameritech公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、貝(bei)(bei)(bei)(bei)爾(er)(er)(er)西(xi)南(nan)(nan)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、貝(bei)(bei)(bei)(bei)爾(er)(er)(er)西(xi)部美(mei)國(guo)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、貝(bei)(bei)(bei)(bei)爾(er)(er)(er)大西(xi)洋公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)、貝(bei)(bei)(bei)(bei)爾(er)(er)(er)南(nan)(nan)方(fang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)和(he)(he)Nynex公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)。