The phone message starting with 400 failed. How to contact?

The phone starting with 400 failed to send a message, so you can call back the phone starting with 400 directly. According to the query related information: 400 mobile phone itself can not send and receive short messages. The telephone number starting with 400 is not the area code of a place, but a toll-free telephone number, which is used by large enterprises and institutions as foreign service. 400 is the calling and called shared payment intelligent service access code, with the total number length of 10 bits. There is a charge for making 400 calls, including local calls and long-distance calls.