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Android SDK 23 introduced a new way to handle permissions, so as a temporary workaround you can set it to build for SDK below 23. As a permanent solution you have to ask user during runtime for permissions with checkSelfPermission() or requestPermissions()
You need to request READ_PHONE_STATE permissions before using of this method.
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java.lang.SecurityException: Requires READ_PHONE_STATE: Neither user 10835 nor current process has android.permission.READ_PHONE_STATE.