As someone who can't hear high pitches at all, I do recognise this funky bouncing of frequencies at the edge of my hearing range (probably around 15 kHz, I haven't precisely measured it). It's surprisingly hard to locate sound sources when you only hear them when you're facing a certain angle in a certain spot in the room! These are always too quiet for my phone to pick up, so that's no help sadly

I wonder if there'd be a market for a variant of a phone model that is just all-round decent, but has a better microphone and other sensor upgrades. I run into the sensor limits a lot (probably weekly) but also don't want to permanently run around with a bulky sensor board in my pocket :<