It's both - the Android app would need changes and you need an app on Bangle.js to actually make the calls
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's both - the Android app would need changes and you need an app on Bangle.js to actually make the calls