One is the other party's number, which is a virtual phone number. At this time, the callback will not be able to get through. This kind of phone call is generally advertising and fraud. Another possibility is that the other party is calling from abroad, and your phone has not been opened for international calls. At this time, the callback is also a failure.

The success rate of using this computer system to dial telephone sales is not very high, but many real estate sales, insurance, loans, credit cards and other enterprises still choose this form because of its low cost and low cost.