What's the deal with the micro usb cable? I have several micro USB cords from HTC phones, Motorola phones, and LG phones. NONE of them will "pop up" the "connect phone via USB" notification message. I have to use the cable that came with it. I didn't think it was proprietary but I don't know how to figure this one out. The other cables charge it fine, but my PC doesn't see the phone and the phone doesn't recognize the PC unless I use the cable that came with it. Weird.