Good USB-C mic for phone?
Microphone and Android Phone - Microphone - Critter & Guitari
External USB-C microphone with iPhone / iPad - Reviews - MPU Talk
Looking for a good USB-C microphone for Android phone
No mic needs the throughput of USB-C so you will be hardpressed to find one that isn't an overpriced, underperforming gimmick. Made for people with phones without a 3.5mm jack.
If you are deadset on a USB mic get a normal one and buy a cheap adapter.
You would be better off with getting a ZOOM H4n Pro or similar recorder which has the included mics or the ability to plug in XLR mics.
Probably more expensive, but if you don't yet have a USB audio interface, like a Focusrite Scarlett, having the more portable H4n (or similar) would work for both portable and in studio needs. Just record to SD card, then put the SD card in your computer to edit in your DAW of choice. Unless in studio you need more than 2 XLR ports.
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I'm looking for a reasonable mic that I can plug into my Android phone for voiceover work I have a proper one for my PC already, but have a need for a mobile one as well. Any recommendations?