English: Hello, when I export my game to android and I transfer it to my smartphone, the APK does not install, please help.
Español: Hola, cuando exporto mi juego para android y lo paso a mi celular inteligente no se instala el APK ayuda por favor.
Do you get any other error messages? Its hard to say what could be causing the issue, as "app not installed" is a generic message Android gives when one of a number of different issues occur.
What version of Android are you using? The official Godot export templates support Android 4.0+, so if your android device is running an older version of Android, you may need to compile Godot targeting a lower Android version (which may have other issues, I'm not sure)
Disclaimer: I am not an Android developer and have very little experience with Godot and Android.