It's not necessary. In 2022, IOS escaped from prison, and novices who don't like tossing are not recommended. After all, jailbreaking is risky, and some system core files may be touched, which may lead to system crash. To realize various personalized functions, you need to be familiar with the usage of various plug-ins. In addition, modifying the prompt tone and changing the operator name requires a certain understanding of the IOS system file directory.