Will Apple's mobile app steal information such as address books and text messages without people knowing it?

Without jailbreaking, the IOS application can get the phone number at most, and others need extra authorization, so they can't read it without permission. In addition, IEMI uses a virtual number and will not give the real number to the mobile phone.

For Android, it is not a day or two since you are not allowed to use it, but it is much better now. If it is obtained without authorization, it means that there is a problem with the system, and you can also share data with other apps through background services. As for IEMI, you don't have to apply first.