There is an app called Alexa listens which basically turns your phone into an Alexa device.
It shows up in your Alexa app as an Alexa device just like your echo, dot, show, tap.
I don't think you can control the dot directly with it but you might be able to use it for the new multi room music feature.
I haven't used it to much other then to turn on/off devices and request a flash briefing.