I was using my phone earlier today for testing apps. I plugged it in later today to test another and eclipse wouldn't recognize it. I looked everywhere. I'm not sure why it wont work. Im using a Samsung Galaxy S3 device. All of the drives properly installed and updated. And debuggin is on.
I have only used my phone to test for one day. And all day i had my phone connected cause i was teathering. I turned my teather back on and viola, problem solved.