I need a true walkie-talkie style mobile app that pairs two or more phones over Bluetooth only—no Wi-Fi, no cellular data, and no internet fallback—so security teams, motorcycle riders, and drivers can talk even when completely offline. Android is the first milestone, but the same feature set must ultimately be compiled for iOS as well. The conversation must flow through Bluetooth ear devices by default, with seamless switching between VOX for hands-free chatting and a crisp on-screen Push-to-Talk button. Latency has to feel instant, audio quality clear enough for noisy streets, and the connection reliable up to the typical Bluetooth range. Core deliverables: • Full Android build (APK + source) and an equivalent iOS build when ready • Clean, well-commented source code showing how audio is captured, compressed, transmitted, and played solely over Bluetooth • Simple UI: channel selection, VOX toggle, big PTT button, battery/connection status • Short setup guide so non-technical personnel can pair devices, choose a channel, and start talking in under a minute A bonus would be background operation with the screen off, optional wired-headset or built-in speaker fallback, and any tweaks that improve clarity for helmets or vehicle cabins. Let’s keep the tech lean, the interface intuitive, and the audio rock-solid.