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Amazon.com: iphone audio connector
https://www.amazon.com/iphone-audio-connector/s?k=iphone+audio+connector
iPhone 4 Headphone Jack & Volume Control Cable …
https://www.ifixit.com/Guide/iPhone+4+Headphone+Jack+&+Volume+Control+Cable+Replacement/4337
iPhone 4 - Technical Specifications
https://support.apple.com/kb/SP587?locale=en_US
iPhone 4 audio jack pinout at DVinfo.net
https://www.dvinfo.net/forum/all-things-audio/495550-iphone-4-audio-jack-pinout.html
For mic in, you want the docking connector on the bottom of the iPhone. The Fostex AR-4i adds external microphones to the iPhone by this route. And yes, it comes complete with an app for controlling levels, EQ, etc. and a headphone jack for monitoring. It actually looks like a fairly complete solution to adding external mics to an iPhone.
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