I have been running a Sprint FrankenPre 2 for a couple of months now, but ran into something odd today. I connected the headphone jack on the phone to the line-in on my PC, so I could play some of my music through my PC's external speakers using Music Player Remix.
But...as soon as I plugged in the cable...the Pre 2 Voice Dial app launched prompting me to say who I wanted to call. I dismissed the voice dial app and that left me in the phone app. I got rid of that and went back to my music....only to have the Voice Dial app pop up again. After several cycles of this pattern, I gave up and just plugged my headphones into the phone.
Could it be there was some small amount of feedback or noise coming from the line-in jack on the PC that made the phone think I was using headphones with a built in microphone?