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1) Yes, the USB port will charge an iPhone.
2) If you're using all those cords, there's no reason why you couldn't connect your phone to the USB port to offset the BT drain and just use your phone w/ the BT connection. I have an iphone and do this all the time.
3) You might want to see someone about your phone overheating. I talk on my phone regularly with the BT connection on and Trapster running and it gets warm, but not hot to the touch.
Basically, if you're happy with the way you've currently rigged it, more power to you -- but I think you might be reinventing the wheel a bit.
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