What you want to ask is what does it mean if the simulator installation shows no signature? It means that the program has been tampered with, not the official version. The programmer's software development technology network said that the unsigned simulator means that the program has been tampered with, not the official version, and there may be security risks, so users should use it with caution. The significance of signature is to ensure the legal ID of each application developer and prevent some developers from using the same PackageName to replace the installed programs.