In order to attract customers, contract service providers use ios self-signed software as a gimmick to attract customers. However, the stability of this certificate is extremely poor, and it is very likely that it will be cancelled soon after signing. Moreover, this so-called ios self-signed software has no after-sales service, and no one cares if it is cancelled. If it is cancelled for a long time, it will lead to the loss of a large number of users, which is not worth the loss.