I used to until I had to sell my 2009 Camaro for something a little less expensive and fuel efficient. Worked great through the cars audio system.

I refuse to use earbuds and earbudlike devices. They're uncomfortable, won't stay in, and I'm sure there's a risk of microbes somewhere.

A while back I got ahold of an old hands-free earpiece that plugs into the headphone jack. There's an extra cord to contend with, but when I walk around with it I feel like I'm in an action movie.

Depends. Typically I still find myself using my corded ear buds but if I'm in the car and the ear buds aren't handy, I'll grab my Bluetooth. Supposedly my laptop has Bluetooth so it'd be interesting to know if I can pair them and use them in-game...

I rarely talk on the phone, but when it do it's almost always with work.  I do use one usually because I'm either driving, and I hate having to hold a phone to my ear.

I have on occasion used a blue-tooth ear thingy. Worked great, just press a button on the ear-piece, and talk away. Basically did not like having to wear some Startrek looking thing, so ditched it.

When, and if, Mfrs. come up with a micro {near-invisible} version I would reconsider them, although walking around appearing to converse with thin air has its drawbacks lol...