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I have recently installed an Android app from the Play Store. While registering in it, I realized that it was able to read my message of OTP without even asking for my permission to read the message.

I have AOSP Extended 5.8 with the August security patch. It's an Android Oreo 8.1 based custom rom.

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Verification by OTP uses a different API which doesn't need read SMS permission. You can read more here Perform SMS Verification on a Server

Hence, the app isn't reading your SMS but using a separate channel to read specially formatted text messages

I learnt of this when an Xposed module to block permissions did not work as I expected (similar case) and the developer explained the reason

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  • How it is decided that which app can use api to read which text? There must be something that prevents X app to read text of Y app by using API's.
    – ankk98
    Sep 15, 2018 at 10:28
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    Also, if you read the linked API it talks about hash and coding which means only the authorized app can read
    – beeshyams
    Sep 15, 2018 at 10:37

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