Android Voice Call App

I’m building a straightforward voice-only calling app dedicated to Android. The core requirement is rock-solid one-to-one voice communication, so there’s no video feed or chat module to worry about—just clean, low-latency audio calls. Users will sign up and log in with phone-number verification (OTP/SMS). Once authenticated, they should see a simple contact list, tap a name, and place a call. Think of an experience as seamless as a standard dialer but inside its own sandboxed app. What I need from you: • Full Android Studio project (Kotlin or Java) with well-commented source code • Functional APK for testing on Android 10+ devices Acceptance: • Phone verification must complete within two steps and fail gracefully on bad codes • Voice connection should establish in under five seconds on a standard 4G network and remain stable for at least a five-minute continuous call • No crashes or obvious memory leaks during repeated call cycles If you prefer WebRTC, SIP, or another proven voice stack, let me know in your proposal; I’m flexible on the underlying tech as long as it delivers clear audio and is easy to maintain.

Project ID: 40588001