2. Certificates are signed by applications, and some software can only be installed on your mobile phone after being signed by certificates.
3. The most basic applications (such as calculators, e-book software, e-mail software), themes, games, etc. , usually do not need to sign, because their permissions are very low and there is no danger. Of course, your mobile phone needs to be set up first (in the menu key-Installation-Program Management-Options-Settings, select "All" for software installation and "Close" for certificate check).
4. Individual software that doesn't need to be signed can't be installed by signing rashly. For example, it was officially issued by Nokia, because Nokia's official software is authorized by high-power manufacturers 18-20, and you only applied for personal permission 17.
5. official website can find out. Generally, the software of this machine can be installed without signature, such as QQ Pinyin, incoming calls and so on.
Supplement:
1. Panda reader, you go to official website, download it to your computer, copy it to your mobile phone, and you can install it without signature. However, it is not recommended that you use it. At present, Ibook is the first reading star, and official website will go to the next S603 edition.
2. That Hume theme, novices should never go down, and there are some themes of secretly charging.
PS: LZ, I have made so many door-to-door calls, and you haven't figured out what a signature is. If you have issued a certificate, please download the signing tool from the forum and take a few minutes to read the instructions. I have worked hard, so you should at least study.
Otherwise, I have to say: with your IQ, it is difficult for me to explain it to you clearly. . . LZ, you are not suitable for playing smart phones. . .