I need a robust, production-ready mobile application for both iOS and Android that mirrors the core value of Truecaller: instantly displaying who is calling and actively filtering out spam and scam numbers. The priority features are clear—reliable caller identification and real-time spam blocking—so the user never has to wonder who is on the other end of the line or deal with unwanted calls again. I expect the full development cycle handled: UX/UI design that feels modern and familiar, a secure back-end with an intelligently curated phone-number database, seamless integration with each platform’s native call-handling APIs (CallKit for iOS, Telecom API for Android), and rigorous privacy safeguards that meet Apple and Google policy requirements. Consistent performance across devices is essential, as is a clean, reactive interface built with either Swift/SwiftUI and Kotlin/Jetpack Compose, or a cross-platform stack such as Flutter or React Native—present your reasoning in your proposal. To be considered, please submit a detailed project proposal. Outline your technical approach, timeline, and the data sources or enrichment techniques you would employ to keep the caller ID database accurate and the spam filter effective. Highlight any previous work on telephony, VoIP, or large-scale data apps that demonstrates you can deliver a secure, low-latency experience. Deliverables (at minimum): • Fully functional iOS and Android apps with caller ID and spam blocking enabled • Scalable, GDPR-compliant back-end (REST or GraphQL) with admin dashboard • Automated test suite and CI/CD pipeline setup • App Store & Google Play deployment support plus post-launch bug-fix window I am ready to move quickly once I see a well-structured plan that convinces me you can replicate—and improve on—the Truecaller experience.