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    It's perhaps worth noting that in case of SMS verification the app does not and cannot read any of the SMS messages - Play Services service looks for the OTP string, parses it out and passes only the OTP code to the app. It does not forward any other SMS content to the app. Commented Nov 25, 2019 at 22:30
  • TL;DR Google read the SMS and parses the OTP. The App only communicates with the Google service that only provides the parsed OTP token. This also means that Google API will fail with strange OTP SMSes, although I'm pretty sure it works 99.9% of the time and if it fails it means your SMS has extra data in a weird format that shouldn't be there in a plain OTP SMS message in the first place. Commented Nov 26, 2019 at 19:36