'Advice for developing Android Apps for eCom ex-handy intrinsically safe phone

Although the ex-Handy Phone runs Android 8.1, the screen is tiny and the keyboard is numeric keys only. Has any 3rd party developer (i.e. not the company that produces these phones) got any recommendations on how these factors (screen and limited keyboard) affect Android App development for these devices. Secondly can you actually submit an App to Google Play in 2022 that is limited to Android 8.1?



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