Your iPhone is already capable of capturing amazing photos and videos. You will still need a decent external microphone. Here are 3 lavalier iPhone microphones that can help:
Polsen MO-IDL1 Lavalier Microphone: a lavalier condenser microphone with a DSLR/smartphone switch for podcasting, vlogging, and interviews. It has a 20 Hz to 20 kHz frequency response. The MO-IDL1 has an omnidirectional polar pattern.
Rode smartLav+: a smart omni-directional lavalier mic with TRRS jack. It features a kevlar reinforced cable. It comes with a wind shield and durable mounting clip. Turns your iPhone into a field recorder.
CVM-SIG.LAV V05 MI: a lapel microphone with Lightning interface. It features real-time audio monitoring. You also get a gain control wheel. It has a frequency response pf 60Hz – 18kHz. Runs on a CR2032 battery.
Have you found better lavalier microphones? Please share them here.