400开头的号码是叫全国服务电话。对于拨打这个号码的用户来说他是不分区号的，全国各地拨打他时收费标准都是根据拨打方的话费标准收的。对于接听方来说，也就是说这个号码的使用企业来说，他要求这个号码归属在哪个城市，这个号码就能归属到哪个城市。
The number at the beginning of 400 is the national service number. For the user who dials this number, he does not have a partition number. When dialing him all over the country, the charging standard is based on the calling party's charging standard. For the receiver, that is to say, the user of the number requires that the number belongs to which city, and the number can belong to which city.
400电话无归属地
400 phone no home
如果拨打方想查这个号码的归属地的话是很难的，因为可能使用这个号码企业自己都不知道他的号码是归属在哪里。
If the caller wants to find out the location of the number, it is difficult, because the enterprise may not know where the number belongs.
400电话全国收费相同
400 telephone charges are the same across the country
无论是拨打400电话，还是办理400电话，全国400电话收费是相同的，所以用户也需执着于400电话的归属地。
Whether you dial 400 or handle 400 calls, the national 400 phone charges are the same, so users also need to adhere to the location of 400 calls.