I have implemented Firebase phone authentication in my Android App.. It works fine. But SMS is not received on many phones, specifically 3g phones. 4g compatible phone work fine. What could be the reason? Any help is appreciated.
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Any suggestion? – user2385301 Oct 18 '17 at 10:54
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take a look at this link https://stackoverflow.com/questions/37973945/firebase-servers-not-reachable-when-using-mobile-phone-data-3g-4g – Reeman Adel Mar 29 '18 at 19:44