Suitable for Nokia mobile phones with s60v3 system. The purpose of applying for signature and certificate is to make some mobile phone software that needs advanced permission have higher permission to use mobile phone data. If you don't sign it, you won't get high authority, so you can't install it. Cracking is to let the mobile phone have the highest authority on the mobile phone software, so that all software that needs to be signed to have high authority can be installed and used without signature. The certificate used for each software signature is the same. Where to apply for signature, it is best to use the signature software recommended by it. It's all personal understanding, but experts don't laugh. )

I have used Nokia's smart phone for several years myself, and I have never cracked it. Although it's easy to crack, I'm still afraid of any accidents. The post in the mobile phone forum I read before said that s60v3' s mobile phone has a certificate mechanism to prevent some untrustworthy software from being installed casually. S60v3 has 20 permissions, which is equivalent to putting 20 locks on the mobile phone. Usually, it will give you several keys, while some more advanced applications need more keys to open the door. Using signature makes this software need more keys, which is enough for this software. The certificate I applied for in Saipan forum before seems to be 13 permission. Cracking a mobile phone is equivalent to directly opening all 20 locks of the mobile phone, and all resources of the mobile phone can be used by any software. I saw these in Saipan Mobile Forum a long time ago. You can go to that forum and have a look. It's good and you know a lot about some details of mobile phones. I hope what I wrote is helpful to you.