I need our live React Native app, “SpakSpak,” extended in two clear steps. First, expand the existing email-based authentication by introducing phone-number sign-up / log-in with secure SMS OTP delivered through Firebase Authentication. The flow must slot neatly into the current user table, run the usual verification checks, and keep the original email path fully operational. Any new code should be concise, well-commented, and follow the conventions already in the project. Second, take the same codebase and turn out a production-ready iOS build. My Apple Developer account is active, so certificates and profiles can be issued immediately. Please handle Xcode configuration, resolve any platform quirks, and ensure smooth performance on both the latest devices and older supported versions. When the build is solid, walk me through App Store Connect so we submit and clear review without surprises. Deliverables • Updated Android build with phone-OTP login running on Firebase • Universal iOS build (debug + release) prepared for TestFlight and final submission • Step-by-step setup notes, environment files, and full source under version control I will require: – Evidence of prior React Native work that involved Firebase or comparable auth flows – Rough timeline for each milestone and a single fixed price for the whole job – Confirmation that no access is retained once hand-off is complete Let me know if you have any immediate questions about the current repo or backend endpoints; otherwise, send over your portfolio links and we can get started.