[Denvercoder9]

Some smartphones are locked down by their vendors. There's plenty of options to get full root access on something that's for all intents and purposes a smartphone, especially if you don't particularly care about warranty and/or keeping commerical apps functional.

[kube-system]

The radio on all commercially available smartphones are locked down to meet regulatory requirements and runs on an entirely different CPU from the Android OS that you might have root on.

[Denvercoder9]

The same's true for the radio on a Raspberry Pi, though.