I need help diagnosing and fixing an issue in my mobile app: when I attempt to register a new account, the screen shows “Mobile number verification otp numbet not received.” No SMS ever arrives, so the registration flow cannot continue. What I already know • The problem occurs inside the mobile app’s phone-number registration step. • The OTP request is sent, but the code never reaches the handset. • No other crash or freeze appears—just the missing code. What I need from you 1. Analyse the client-side code to confirm the request is formed correctly. 2. Trace the request on the back-end/SMS gateway (Twilio, Firebase Auth, or any relevant provider) and identify where the OTP is lost. 3. Implement the fix—whether that means adjusting API keys, headers, callback URLs, timing, or retry logic. 4. Supply a concise technical report detailing root cause, the code changes, and how to reproduce the solution. 5. Deliver a tested build (Android and/or iOS, as applicable) that reliably delivers the OTP. I will provide source code, current API credentials, and test numbers once we start. A thorough walk-through of your changes and a short hand-off call are expected so I can maintain the solution going forward.