Whenever Braden uses his smartphone to record, the audio is terrible. Leo says that phones these days use multiple microphones and dedicates one for noise cancellation. If he doesn't have that feature, then an external microphone connected to the phone with an adapter will work. The iRig may be good for that. Audio Technica also makes a microphone that can plug into a smartphone, but it looks like a big stage microphone. The Rode iXY stereo microphone plugs into the iPhone and has stereo recording.
The best option may be just to get a dedicated Zoom H2 recorder.