The mobile phone number shows whether the empty number has been cancelled.

According to Zhongguancun online query, the display of an empty number on a mobile phone number usually means that the number has been cancelled. After China Mobile Company adopts the number protection service, if the mobile phone number is no longer used and exceeds the specified protection period (three years), the number will be taken back and put into use again, and the original user can no longer use the number. In this case, if a new user enters a number, an empty number will be displayed. In addition, if the mobile phone number is overdue for more than three months, it may be taken back by the mobile company and put into use again.

Cancellation of mobile phone number, also known as downtime cancellation or service cancellation, refers to the process of deleting the mobile phone number from the account registration of the telecommunications department of the public security organ when the mobile phone is scrapped or the operator is changed, that is, canceling the contract with the operator.