400电话要求：400电话办理必须是企业。
400 telephone requirements: 400 telephone handling must be an enterprise.
400电话申请之后，运营商会为其分配400号码，400电话是全国统一接入码，在全国任何范围内，主叫用户只需拨打该400号码，无须加拨区号，便可按照企业业务用户预先设定的方案，将呼叫直接接续到客户所指定的电话号码。
After the 400 call application, the operator will assign the 400 number to it. The 400 number is the national unified access code. In any scope of the country, the calling user only needs to dial the 400 number without adding the area code, and then can directly connect the call to the telephone number designated by the customer according to the scheme set in advance by the enterprise business user.
400电话能否办理成功，很大的情况取决于企业提交的资料，运营商的审核，所以企业想要尽快办理400电话需要提交最完善的资料，让审核一次性通过。
Whether the 400 telephone can be handled successfully depends on the information submitted by the enterprise and the review by the operator. Therefore, if the enterprise wants to handle the 400 telephone as soon as possible, it needs to submit the most perfect information to let the review pass at one time.