You cannot download Messenger from the Google Play Store (not available) or install the modern Android APK.
However, you can use to access Facebook chat: Method 1: Use the Built-in Facebook App (Easiest) The Rex 70 comes preloaded with a Java-based Facebook app . samsung rex 70 facebook messenger download
Important Note – Device Limitations The Samsung Rex 70 is a feature phone (not a smartphone). It runs on a proprietary RTOS (Real-Time Operating System) with Java (J2ME) support, not Android . You cannot download Messenger from the Google Play