First of all, Saipan S60 has the second edition and the third edition, which has been the third edition since 3250. You should know which version of your mobile phone is. If you don't know, I'll sweat you first, and then you can go to the Symbian smartphone forum-Symbian smartphone Chinese portal. Look at the Saipan software resource area. Theoretically, it is possible for the third edition software to be universal. That is to say, theoretically, the software of N73 6 120 can be used, but it is not necessary. The third edition and the second edition have one more certificate signature, and there may be more. I don't know yet. Let's talk about the relationship between certificate and signature. A certificate is used to sign the software you want to install. A lot of software in the third edition needs to be signed, and it can't be used normally without signing. For example, incoming calls can be started automatically every time they are turned on, or they can be started manually. The certificate is bound to your mobile phone (when making the certificate), which means you can't use other people's certificates. A mobile phone can have n certificates, but in order to save resources, a mobile phone can have one certificate. The certificate is valid. You can see it by double-clicking the computer. If you are prompted to install the software after the expiration, you can change the date of the mobile phone to the expiration date of the certificate before installing the software, and then change the date back after the installation. A certificate is just a file with the extension. cer。 Signing a contract is a process. Certificate+file to be signed → signature (there are many kinds of special signature software) → available software. If there are still people who don't understand, you can think that a certificate is like the official seal of your company, and unsigned software is like an invoice. Your invoice can only be used with your official seal, so you can use this official seal to stamp different invoices. As for how to apply for a permit, you can go to the application area for help. The specific website /viewthread.php? tid = 200 1 & amp； Highlight =%C7%A9%C3%FB has a tutorial on making certificates.

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