It would appear the mic on the AppRadio 1 has died. The last couple of calls I've tried to take, the other party doesn't hear me.

Are there aftermarket replacement options?

I'm having the same issue as well...this mic is garbage

i haven't tried this yet, but it looks like a mic on a regular 3.5 mm jack.

those are easy to find, like on Amazon.com

http://www.amazon.com/Olympus-ME-52W-Noise-Canceling-Microphone/dp/B000MYPPPE/ref=sr_1_2?ie=UTF8&qid=1343582603&sr=8-2&keywords=olympus+mic for instance.

I've been actually looking at this mic and similar ones since I first got the radio because I think the stock mic is garbage too.

Let me know if you try it and it works.