400電(dian)(dian)(dian)話(hua)(hua)是一(yi)種在中(zhong)國(guo)(guo)大陸地區使用(yong)的(de)(de)電(dian)(dian)(dian)話(hua)(hua)服(fu)(fu)務，它是由(you)三(san)大運(yun)營(ying)商共同(tong)提(ti)供(gong)的(de)(de)一(yi)種虛(xu)擬(ni)電(dian)(dian)(dian)話(hua)(hua)號碼。400電(dian)(dian)(dian)話(hua)(hua)號碼不分屬于(yu)哪個單一(yi)運(yun)營(ying)商，而是由(you)中(zhong)國(guo)(guo)移動、中(zhong)國(guo)(guo)電(dian)(dian)(dian)信和中(zhong)國(guo)(guo)聯(lian)通這(zhe)三(san)家(jia)主要(yao)的(de)(de)電(dian)(dian)(dian)信運(yun)營(ying)商共同(tong)提(ti)供(gong)。企(qi)業(ye)可(ke)以向這(zhe)些運(yun)營(ying)商申請(qing)400電(dian)(dian)(dian)話(hua)(hua)號碼，用(yong)于(yu)統一(yi)對外(wai)宣傳和服(fu)(fu)務熱線(xian)，方便客(ke)戶撥打(da)(da)。這(zhe)種電(dian)(dian)(dian)話(hua)(hua)服(fu)(fu)務通常(chang)用(yong)于(yu)企(qi)業(ye)的(de)(de)客(ke)服(fu)(fu)中(zhong)心(xin)，可(ke)以實(shi)現(xian)主被叫分攤付費，即撥打(da)(da)400電(dian)(dian)(dian)話(hua)(hua)的(de)(de)用(yong)戶只需要(yao)支付本地通話(hua)(hua)費，長途費用(yong)由(you)企(qi)業(ye)承擔(dan)。