Nowadays, smartphones are becoming more and more popular, and their functions are really powerful. What function do you want? Just find a software installation! It used to be a very simple thing to install software on a mobile phone, just install it directly on the mobile phone, but now some mobile phones can't do this. These mobile phones actually refer to mobile phones equipped with S60 third edition operating system, such as "Nokia" and "N73". Then what is a signature and why do you want to sign it? Simply put, in order to improve the security of the system, general software can't directly operate the hardware. For example, starting software with a mobile phone is a dangerous operation. If you insist on this function, you must find someone to be responsible for your behavior! In case something goes wrong with the mobile phone because of this operation, this person will be responsible. If it is determined, who will be responsible? Then you need to sign the software. What do you mean you can sign the software directly? In fact, we consider ourselves the authors of software. You need to install your own software on your mobile phone for testing. I am responsible for my actions! Look at the meaning of signature! Ha ha! In a word, you are responsible for the software you install. If there is something wrong with your mobile phone because of this software, it is your own problem! Manufacturers don't care!

Seek adoption