（1） 400 telephone unified enterprise contact information Now when an enterprise has many departments, various product types, and many branches, it often has many different contact numbers, not to mention those large enterprises and groups with businesses throughout the country, and they have numerous phone numbers. On the one hand, such complicated enterprise contact numbers are not only inconvenient for users to remember, but also cause certain obstacles to the external publicity of enterprises. On the other hand, a 10-digit 400 phone number can be bound to multiple physical phones or mobile phones and other communication devices owned by the enterprise. The enterprise only needs to publish the national unified 400 number externally, which is convenient for the enterprise to carry out unified publicity, simple and easy to remember, and conducive to business development.

（二）400電話不需要換號400電話號碼的一個典型特點就是一號辦理，全國通用，它不會因為企業地址搬遷、機構裁撤等原因需要更換號碼，它可以一直保持不變，因此企業的原有客戶也不會流失掉。

（2） A typical feature of the 400 phone number that does not need to be changed is that the 400 phone number is handled on the first number. It is generally used nationwide. It does not need to change the number because of the relocation of the enterprise address, the abolition of the organization, and other reasons. It can remain unchanged, so the original customers of the enterprise will not be lost.

（三）400電話擁有豐富輔助功能現在很多主流的代理商給企業辦理的400電話，都會附帶專屬的控制后臺，并且為企業的400電話拓展了很多的實用輔助功能，例如IVR語音導航、彩鈴、短信通知、語音信箱、工號播報、來電分析、分配、通話記錄、來電錄音、客戶信息庫、滿意率統計、防偽查詢等數十種呼叫中心的功能，并且這些輔助功能還不需要企業花費額外的軟硬件投入，也無需人力專門來維護，也就相當于一個小規模的呼叫中心，企業使用起來特別方便。

（3） 400 phone has rich auxiliary functions. Now many mainstream agents handle 400 phone calls for enterprises, which will be attached with exclusive control background, and expand many practical auxiliary functions for enterprises' 400 phone calls, such as IVR voice navigation, color ring, SMS notification, voice mailbox, job number announcement, call analysis, distribution, call record, call recording, customer information database, satisfaction rate statistics Dozens of call center functions, such as anti-counterfeit query, and these auxiliary functions do not require enterprises to spend additional hardware and software investment, nor do they need human resources to maintain them, which is equivalent to a small-scale call center, which is particularly convenient for enterprises to use.