Smartphone Microphones
YouMic Interview Set
This set allows you to have mics for two people so they can both be on camera for an interview. The cords are 6.5 feet each. I recommend also buying one or two 6-foot TRRS extension cables so you have enough mic cord for every situation.
Rode Wireless Go
This is a compact, high quality set at a great price. The transmitter has a built-in mic and can be clipped directly to a shirt or jacket; or, you can buy Rode’s wired lavalier to plug into the transmitter. Battery life is great - about 7 hours.