Why real hardware matters
Most mobile defects that reach users are device-specific: a keyboard that covers the submit button, a permission dialog the emulator never showed, a list that stutters on a mid-range phone. Running on physical Android devices means your tests see what your users see.
A device lab without the lab
You don’t need a rack of phones or a dedicated machine. Any Android phone can join by installing the CodeReviewer agent app and scanning a pairing code. Admins see every registered device in one place and assign them to the projects that need them.