400開(kai)頭的(de)(de)電話并(bing)不一(yi)定(ding)是(shi)聯(lian)通的(de)(de)，屬于(yu)聯(lian)通號(hao)段(duan)的(de)(de)包括(kuo)：4000和4006;4001和4007屬于(yu)移動(dong)號(hao)段(duan);4008和4009屬于(yu)聯(lian)通號(hao)段(duan)。不需要上(shang)門安裝，400電話多是(shi)利用了(le)電話呼叫轉(zhuan)(zhuan)移的(de)(de)原理，(試想下(xia)您(nin)(nin)如(ru)何做手機呼叫轉(zhuan)(zhuan)移的(de)(de)〕，所以只需要您(nin)(nin)給(gei)運營商提(ti)供需要綁定(ding)的(de)(de)固定(ding)電話或(huo)者(zhe)手機號(hao)后，客戶打(da)400號(hao)碼，即刻就呼轉(zhuan)(zhuan)到您(nin)(nin)的(de)(de)固定(ding)電話或(huo)手機上(shang)了(le)。

400電(dian)(dian)(dian)(dian)話(hua)是一(yi)種主(zhu)被(bei)叫(jiao)分攤(tan)業(ye)務(wu)，即主(zhu)叫(jiao)方(fang)承(cheng)擔市話(hua)費(fei)(fei)。400業(ye)務(wu)優勢和業(ye)務(wu)功能類似于800免費(fei)(fei)電(dian)(dian)(dian)(dian)話(hua)，但400電(dian)(dian)(dian)(dian)話(hua)業(ye)務(wu)是800電(dian)(dian)(dian)(dian)話(hua)業(ye)務(wu)的(de)(de)升(sheng)級版， 它(ta)將傳統的(de)(de)電(dian)(dian)(dian)(dian)信資源與現(xian)代cti 技術完美(mei)結(jie)合，融(rong)入先進(jin)的(de)(de)客(ke)戶(hu)服務(wu)理念，來幫助企(qi)業(ye)快速建(jian)立自己的(de)(de)客(ke)服中心，旨在提升(sheng)企(qi)業(ye)的(de)(de)服務(wu)品牌形象，進(jin)而提升(sheng)市場競(jing)爭力(li)。撥打聯(lian)通(tong)(tong)400電(dian)(dian)(dian)(dian)話(hua)要(yao)收(shou)費(fei)(fei)，不僅對撥打聯(lian)通(tong)(tong)的(de)(de)電(dian)(dian)(dian)(dian)話(hua)要(yao)收(shou)費(fei)(fei)，對撥打電(dian)(dian)(dian)(dian)信的(de)(de)電(dian)(dian)(dian)(dian)話(hua)和撥打移動電(dian)(dian)(dian)(dian)話(hua)的(de)(de)電(dian)(dian)(dian)(dian)話(hua)都(dou)要(yao)收(shou)費(fei)(fei)，費(fei)(fei)用(yong)按當地城市電(dian)(dian)(dian)(dian)話(hua)費(fei)(fei)收(shou)取。

那(nei)為什么還(huan)說(shuo)是免費400電(dian)話(hua)？

免(mian)費400電話，企業辦(ban)理(li)時免(mian)費，前提是申請免(mian)費。

預存話費發400，三年只需1800元。