For detailed steps, please refer to:
https://blog.csdn.net/idlear/article/details/50999490
Notice:
The IOS system needs to install the description file first, and the path is as follows:
"Settings" -> "General" -> "Profile"
In addition, for iPhone systems above IOS10, you need to turn on the trust certificate switch. The path is as follows:
Settings--General--About This Machine--Certificate Trust Settings--(the switch corresponding to the certificate).
At this point, you can happily monitor and modify mobile phone requests