Free Android MIDI Music Making Apps — iConnectivity
Connect MIDI controllers to a PHONE, apps to use | iPhone, Android - YouTube
Old Phone Becomes MIDI Controller | Hackaday
Control MIDI and Ableton from your iPhone, Android for handheld music - CDM Create Digital Music
Amazon.com: HUAZHUN USB C to MIDI Cable, Type C to USB B Cord for Laptop MacBook Samsung Google Smartphone to Printer, Midi Controller, Midi Keyboard, Piano, Recording Audio Interface, USB Microphone(3.3FT) :
Android MIDI Controller
FL Studio Mobile
Free Android MIDI Music Making Apps — iConnectivity
hollyhook releases midiHook - MIDI Controller driven by wearable motion and smartphone sensors for Android and Windows
How to Connect a MIDI Controller to a Smartphone : 3 Steps - Instructables