Urgent Mobile App Developer Needed to Fix OTP Country Code Issue (Flutter/Android/iOS)

I urgently need an experienced mobile app developer to resolve a persistent OTP issue in my application, where the system always sends the phone number with country code (+92) regardless of the user’s actual selection—for example, if someone chooses Iraq (+964) or Kuwait (+965), the app still defaults to +92. The job requires thoroughly checking and correcting the country code picker and phone input logic, ensuring the chosen country code is passed correctly to the backend or API, fixing the OTP sending process for all countries, and testing with multiple international numbers to guarantee proper functionality on both Android and iPhone (where applicable). I’m looking for someone skilled in OTP integrations (Twilio, Firebase, MSG91, WhatsApp API, etc.), familiar with Flutter, React Native, Android or iOS, experienced in backend API debugging, and comfortable using phone number validation libraries. When applying, please clearly state your experience with OTP systems, share examples of similar projects you’ve completed, and provide your estimated time to fix along with the total cost.