Sennheiser XS Lav USB-C

If the recording quality of your iPhone is not good enough, you can now easily connect a microphone via the USB-C port. The lavalier microphone from Sennheiser is just as suitable for this as podcast microphones with a USB-C connection. And yes, you can of course also choose a wireless version, but the recording quality will always be better with the wired version - and often cheaper to buy.