Need recommendation for lav mic for smartphone

[M A V I C]

I have video experiment I want to try. I want to get decent audio recording an interview with a single person. I'm thinking a lavalier mic connected to a android phone would work great. Doesn't need to be wireless, just 8-12' or so. I'll record video with another camera that doesn't have a line in and sync the two later.

Any suggestions on the mic?

Tia