For some Android apps, you need to obtain relevant permissions. For example, if WeChat wants to use the "voice" function, it must give permission to the microphone, and if Alipay wants to use "sweep" to pay, it must give permission to the camera. Under normal circumstances, most apps will require camera, microphone, reading and writing storage space, and location permission. Without these common permissions, the app may not work properly. However, not all permissions are required. For example, "contact list" and "short message" are relatively private, even involving user security. However, most apps will still ask to read the phone's address book or text message. Some apps have legitimate reasons. For example, WeChat can't add friends with the address book without reading the contact list. Some schedule management software can't use the schedule reminder function if it can't read the user's short message. In fact, the rights management of Android system is perfect now, and any rights required by application software can be seen in the system settings. Users can also disable sensitive permissions of an application according to actual needs.

For some Android applications that can't be opened normally without sensitive permissions, users need to weigh the pros and cons themselves. For example, some applications obviously have no social function, but they require reading contact permissions. If you don't give it this permission, it can't open the application, which is obviously unreasonable. My personal advice is not to use this wonderful application that requires privacy. At present, there are many Android softwares on the Internet that capture users' personal information under the banner of "free". Although these applications may indeed provide some free benefits, their ultimate goal is to capture users' mobile phone numbers and even read contact lists and text messages. You know, a normal user's mobile phone may store hundreds of contact information of relatives and friends. Once these contact information is leaked, all kinds of advertising sales calls and even fraudulent calls will follow.

Some netizens may have the experience that they obviously pay great attention to the privacy and security of their mobile phones and will never disclose their numbers easily. The application software is downloaded from the regular application market, and it is also forbidden to read the mobile phone number. But even so, you will still receive all kinds of spam messages and promotional fraud calls from time to time. This is because your relatives and friends may have installed an application software to read the contact list on your mobile phone, resulting in your mobile phone number being leaked to a third party.

Now is the so-called "era of big data". Various free applications provide a lot of convenience, but they also ask users what they want. Contact information is the most basic one. In addition, it is common to push accurate advertising information to users by collecting users' web browsing records and even chat records. For ordinary users, this kind of data collection is basically impossible to prevent. What we can do is to be vigilant and avoid greater losses caused by privacy disclosure.