Answer to: Galaxy s3 usb port not working?My galaxy 3 stopped charging. I first bought a new charger thinking that was the problem with now luck. I bought a new battery, still no luck. My daughter in law told me she saw online that the galaxy 3 was having issues with the port on the phone collecting dirt and dust. She took to Best Buy and they cleaned it with a wipe around a pin and its working fine. I tried cleaning the port with a pin and believe it or not I'm not having any charging issues. I did not use any contact cleaner or any other cleaning solution just a pin. Hope this helps.