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have you seen this: https://www.rtl-sdr.com/questasdr-new-rtl-sdr-software-for-a...

You could take something like a NooElec (http://www.nooelec.com/) and connect it to your phone. Though you'll need a rooted device.

I tried it and it wasn't the fastest thing out there but let me do some basic scanning.

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I've tried a few of the apps on the Play store (non-rooted) and they did work, but they were crashy and when they did work, clunky to the point of being unusable

GNU Radio has a guide of how to compile it for Android. Having said that, if you're just trying to run it on your phone, it doesn't (usually) have enough power to do anything "fun". You need more capability than your average Android device. The other option is to have something a little more powerful running GNU Radio stack and then control that via your phone :)

Needs tx. LimeSDR Mini or similar would let you test the concepts but obviously embedding it into the device would be best.

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