Functionality & Concepts used :
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I have intregrated Google's Firebase for authentication of users on server side.
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Users can sign-in in app using their phone number, this app automatically detect user's country code.
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After entering phone number, users get one-time-password on their phone number.
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This app automatically detect otp sent to user, no need to type manually 🤓🤓.
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VOILA! 🥳