400電(dian)(dian)(dian)(dian)話(hua)(hua)可(ke)以說是800免費(fei)(fei)電(dian)(dian)(dian)(dian)話(hua)(hua)的升級版本(ben)。針(zhen)對800電(dian)(dian)(dian)(dian)話(hua)(hua)的一些缺(que)點，電(dian)(dian)(dian)(dian)信運營商進行了(le)修訂和(he)升級，實現了(le)目前(qian)企業的400電(dian)(dian)(dian)(dian)話(hua)(hua)。800電(dian)(dian)(dian)(dian)話(hua)(hua)由企業支付高(gao)電(dian)(dian)(dian)(dian)話(hua)(hua)費(fei)(fei)，客(ke)戶(hu)可(ke)以免費(fei)(fei)打電(dian)(dian)(dian)(dian)話(hua)(hua)，所以有很(hen)多無(wu)聊的人打電(dian)(dian)(dian)(dian)話(hua)(hua)，不(bu)僅占用了(le)企業服(fu)務熱線，而且浪費(fei)(fei)了(le)資金，因為(wei)只能接聽固定電(dian)(dian)(dian)(dian)話(hua)(hua)，許多企業想(xiang)了(le)解(jie)和(he)業務不(bu)能打電(dian)(dian)(dian)(dian)話(hua)(hua)，失(shi)去了(le)很(hen)多訂單，當客(ke)戶(hu)想(xiang)打電(dian)(dian)(dian)(dian)話(hua)(hua)咨(zi)詢(xun)外面找一個固定電(dian)(dian)(dian)(dian)話(hua)(hua)亭，非常浪費(fei)(fei)時(shi)間。

企業(ye)400電(dian)(dian)話(hua)沒有這(zhe)些缺點(dian)，400電(dian)(dian)話(hua)的優(you)點(dian)是不(bu)(bu)需(xu)要安裝不(bu)(bu)需(xu)要額外的辦(ban)公設備，只需(xu)要找(zhao)到一(yi)個正式(shi)的代(dai)理來處(chu)理業(ye)務就可(ke)(ke)以(yi)(yi)(yi)(yi)使(shi)(shi)用(yong)。而且在費(fei)用(yong)方(fang)面也(ye)很(hen)優(you)惠，不(bu)(bu)僅可(ke)(ke)以(yi)(yi)(yi)(yi)打開年(nian)度套(tao)餐，而且可(ke)(ke)以(yi)(yi)(yi)(yi)根據中小(xiao)企業(ye)業(ye)務不(bu)(bu)多(duo)的特點(dian)處(chu)理月度套(tao)餐。不(bu)(bu)需(xu)要支付月租(zu)金，沒有最低消費(fei)，大(da)部(bu)分是多(duo)少(shao)。400電(dian)(dian)話(hua)月為單(dan)位，不(bu)(bu)需(xu)要支付月租(zu)金，因為400電(dian)(dian)話(hua)號(hao)碼使(shi)(shi)用(yong)預付費(fei)，月形式(shi)可(ke)(ke)以(yi)(yi)(yi)(yi)預付費(fei)相當少(shao)，也(ye)可(ke)(ke)以(yi)(yi)(yi)(yi)給企業(ye)鈴功能，免費(fei)記錄企業(ye)鈴，可(ke)(ke)以(yi)(yi)(yi)(yi)查看(kan)電(dian)(dian)話(hua)記錄，電(dian)(dian)話(hua)號(hao)碼免費(fei)短(duan)信，也(ye)可(ke)(ke)以(yi)(yi)(yi)(yi)隨時更改轉(zhuan)賬號(hao)碼，大(da)大(da)滿(man)足企業(ye)呼(hu)叫業(ye)務的需(xu)要。