Here is a brief description of how to configure the terminal programme "Another Term" on an Android (ver. 13) smartphone.
Kevin, K3TL, helped me with his description and the screenshoots.
Connect the QMX (or QDX) through an OTG cable to the phone.
Be sure to power up the QDX or QMX before attaching to the phone so the filesystem on the device doesn't get corrupted.
If you have FT8CN or AndFLMsg installed one of them will popup a window asking if you want to connect. Cancel.
Open Another Term and create a profile to start with. Press +
It should pop up a dialog box. There you have to configurate:
UART
80 cols - 24 rows
9600 Baud
It works well on my Samsung A51, Android 13.
Stephan, DD6DO
DD6DO