But does the OS matter much for a feature phone? One does not even really want to write mails with that, those are phones too call someone, write a text, maybe

But does the OS matter much for a feature phone? One does not even really want to write mails with that, those are phones too call someone, write a text, maybe listen to some music (radio) and play some snake. A basic OS might just be okay for that. Now, the atrocity that was the OS for the Nokia Asha phones, that is a completely different story.