We do, but modern smartphones (if you are not talking about regular phones with no ability to run third-party software) are so complex that it would require a L

We do, but modern smartphones (if you are not talking about regular phones with no ability to run third-party software) are so complex that it would require a Linux-level _centralized_ effort to pull off. And it's really hard to imagine any centralized effort in this field given the current competition.