目前400電話(huà)號(hào)碼有三個(gè)，分別是中國(guó)電信推出的4008xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx目前，企業(yè)辦理中國(guó)電信400電話(huà)業(yè)務(wù)主要有兩種方式：運(yùn)營(yíng)商和代理商。

前者是指用戶(hù)通過(guò)電信營(yíng)業(yè)廳辦理400項(xiàng)業(yè)務(wù)。

然而，在實(shí)際業(yè)務(wù)運(yùn)營(yíng)中，電信作為運(yùn)營(yíng)商，更注重傳統(tǒng)的電話(huà)和寬帶業(yè)務(wù)，向當(dāng)?shù)氐谌酱砩谭峙淞?0%以上的400電話(huà)業(yè)務(wù)。

在合作中，電信作為運(yùn)營(yíng)商，主要負(fù)責(zé)提供數(shù)字資源和相關(guān)業(yè)務(wù)資質(zhì)，而下級(jí)代理商負(fù)責(zé)開(kāi)發(fā)400平臺(tái)功能和維護(hù)通信線路。