I need an Android APK that quietly sits in the background, captures every incoming SMS and instantly forwards the full message to one pre-defined mobile number. No UI beyond a simple first-run screen where I can set or edit the destination number is necessary; once configured the service should restart on boot and survive Doze / battery-optimization rules so the forwarding never stops. Please build it so it works on every Android version currently in circulation—from the oldest devices still shipping with SMS capability right up to the latest release—while following modern permission requirements (RECEIVE_SMS, READ_SMS, SEND_SMS, POST_NOTIFICATIONS for Android 13+, etc.). A lightweight footprint and clean, well-commented code are important because I may extend the project later. Deliverable: • Signed, install-ready APK plus full Android Studio source project. • Clear read-me with setup steps and any special OEM permission settings if they apply. Successful delivery means I can install the app on multiple test phones, specify the target number once, and see every incoming text mirrored there without interruption for at least 24 hours of continuous use.