Minimalist Phones with Keyboards and Cheating-Proof Digital Detox Apps: A Guide

[ElliottLoorm]

What are some examples of minimalist phones with physical keyboards (like the qin f21 pro) that support Android-based digital detox applications with cheating protection features? Alternatively, how can one modify the ROM of a small keyboard phone to restrict its functionality to a specific set of non-entertainment apps?
 
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