Mobile phone certificate is a security measure to prevent malware officially launched by Saipan! For example, if you download some software online, but you always get the wrong certificate when installing the software, such as the certificate is expired and the certificate is limited, you must sign the software with the certificate and signature tool to install it smoothly! At present, most software can be installed only after being signed by a certificate! So the mobile phone certificate is a must for Symbian mobile phones!