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I have seen some Android apps on my phone require this android.permission.READ_PHONE_STATE permission. I don't know if I could trust them. I know this permission will give the app access to many information. I'm particularly interested in what functionality in an Android app normally require the information like DeviceId , SimSerialNumber, SubscriberId?
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READ_PHONE_STATE is one of the Android permissions categorized as dangerous. This is because it “allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any Phone Accounts registered on the device” [2] .
Google Play restricts the use of high-risk or sensitive permissions, including the QUERY_ALL_PACKAGES permission, which gives visibility into the inventory of installed apps on a given device.
App permissions help support user privacy by protecting access to the following: Restricted data, such as system state and a user's contact information. Restricted actions, such as connecting to a paired device and recording audio.
Both Apple's iOS and Google's Android systems have evolved to contain very robust data permission regimes and, in general, apps ask your permission to access your data because they need it for one function or another.
Phone state provides access to a lot of information about the phone. Usual usages will be for reading the IMEI of your phone and your phone number. This can be useful to identify you in their systems.
It can also be needed if the application is made compatible for Android 1.5 or lower, because this permission didn't exist back then and is added automatically by the play store to those apps
See also: https://android.stackexchange.com/questions/605/why-do-so-many-applications-require-permission-to-read-the-phone-state-and-ident
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