title: What kind of Android application will require android.permission.READ_PHONE_STATE permission?
body: <p>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 <code>DeviceId</code> , <code>SimSerialNumber</code>, <code>SubscriberId</code>?</p>