Using a USB-C phone with Power Delivery is ideal here, as it allows the phone to be powered while also communicating with the Arduino over USB. The RemoteXY app is built specifically for this purpose.

Specifications of the new Arduino touchscreen display include : – Premium Multi-domain Vertical Alignment (MVA) TFT Display Easy to use 5-point Multi-touch Capacitive Touch Screen ...

The arLCD “all-in-one” modular design unites a 3.5 inch color LCD, touchscreen, 16-bit GPU (Graphics Processing Unit) and mounting bracket, with the Arduino development environment.