The reason Nokia probably didn't do this from the beginning is because technically the charger is rated at 900mA of output, and a USB port isn't spec'ed to put out that much current. That said, I doubt it needs that much current in reality. I did this same mod to my cell phone years ago. Yes, if you do plug-in 5volts to the charger jack, AND a usb cable the power will pass out of the USB connector.