The certificate is because the operating system of the mobile phone was developed by Bansai Company. Now, S60 has the third and fifth editions. For the sake of mobile phone security, the company needs to be responsible for the installed software. So we use the mobile phone identification code (*#06# view) to apply for a certificate on Saipan. With the certificate, we will upload the downloaded software to the internet and sign it. Signing means that the software is safe and can be installed on mobile phones, and many softwares need to be signed.
The software can be installed by the above method, or it can be installed on the memory card of the mobile phone, and the software can be found from the mobile phone and then installed.