Saw two interesting products from NAB 2019 on YouTube that seems really awesome The first is the Rode Wireless Go wireless audio transmitter and receiver: https://www.rode.com/wirelessgo It seems really, really lightweight and easy to use. NoFilmSchool featured it: It seems perfect to dip one's toes in the world of wireless lavaliers systems. The clip on transmitter includes a mic element (or one can use a regular lavalier mic.). The video showed it being used with an iPhone although they need TRS to TRRS cable and the Apple headphone adapter? The other interesting product is Filmic Audio? (Mentioned near end of the video) It appears you can use an extra iPhone running the app to record audio.. and then it can pair and replace the audio on the Filmic Pro footage. THAT seems pretty interesting. Put your old iPhones to use.