I'll mention this here too...
I use an Lg hbs-700 stereo Bluetooth headset every day with my Pre2. It is the most convenient thing I've ever used to pair to a phone.
The device sits under your collar very discreetly, and you can put in either one or both ear buds when you get a call. With both in, you can hear calls anywhere loud. I've taken calls on a moving motorcycle.
If your mic is the only thing preventing you from using a Pre3, and bt still works, i definitely recommend getting one of these models so you can keep going.
Or, if you're really over it, pm me if you'd like to sell one cheap. I'd like to have a Pre3 for my collection. I'd use it as a Pandora streamer at home.