400电话是一种主被叫分摊业务，即主叫承担市话接入费，被叫承担所有来电接听费用。也就是说，400电话的话费由拨打400电话的用户和企业分摊，而拨打方支付当地市话费。所以，手机拨打400开头的电话不是免费的。

400 telephone is a call-by-call sharing service, that is, the caller bears the local telephone access fee, lvhuamiao.37ix.com.cnjidi.37ix.com.cnguohuai.37ix.com.cnnijiangbeng.37ix.com.cnzhajiangb.37ix.com.cn

zhangjiak.37ix.com.cnand is called to bear all caller reception fees. That is to say, the charges for 400 calls are shared by the users and enterprises who dial 400 calls, while the caller pays the local telephone charges. So it's not free for a cell phone to make a 400-start call.

强大的企业总机，无需增加硬件、软件投入，无需人力维护，开通智能400企业热线，企业总机强大功能立即拥有。
Powerful enterprise switchboard, no need to increase hardware and software investment, no need to maintain human resources, open intelligent 400 enterprise hotline, enterprise switchboard powerful functions immediately have.
一线多号、企业彩铃、智能导航、语音信箱、来电录音、分机转接等功能应有尽有。 400企业热线不但可以成为一个分部的总机，更可以作为全国各分支的总机。
There are many functions such as line number, enterprise color bell, intelligent navigation, voice mailbox, caller recording, extension switching and so on. 400 enterprise hotline can not only become a branch of the main machine, but also can be used as the National Branch of the main machine.