That’s something you would do with Phonegap (or other Cordova service). After you make your native app in Bubble, you’ll package it and port it to Phonegap. It’s owned by Adobe (damn) and free (yay). @natedogg has a course that explains it.
The reason you create a native app is so you don’t have to rewrite everything [for phone access] when new hardware is released. That becomes Phonegap’s problem.
Native is also favorable upon by the all knowing, all seeing, Google algorythm.