Step 1) Remove the proposed device from your pocket without altering its current state (don't interrupt playback, or start playing when silent). Step 2) Operate

Step 1) Remove the proposed device from your pocket without altering its current state (don't interrupt playback, or start playing when silent). Step 2) Operate all of the functions of the device one-handed. If you can do that, the controls work. If not, punt.