You know, an uncalibrated mobile device mic might not be as bad as you expect.
See this comparison. My phone's mic didn't have quite the resolution of the two calibrated mics, but it's certainly passable.
Trouble is the lack of useful software. An Android gadget simply has no apps available with which to calculate a corrected response and export biquads into a miniDSP. Even if there were such an app, you'd ultimately still need a PC to apply the corrections. With that in mind, there's not much incentive for a developer to write the app you're looking for. They'd just be reinventing the wheel while making it more complicated to use.