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Effective phone number verification

There are many libraries for efficient pre-built phone authentication, such as Firebase Phone Auth, but if you are an advanced developer and need to build this functionality yourself, Google Play Services has two new APIs that help you obtain a user’s phone number and verify it via SMS without device permissions: the Phone Selector and SMS Retriever. Apps like Flipkart have seen a 12% increase of success rates in phone number sign-up flows using these methods.

SOURCE: androiddevelopers