"Galaxy s3 usb port not working?"に関する回答After cleaning the USB female port it still didn't work however did find out that by lifting the cable a few degrees while in the port a connection was made and charging was good. Eventually I made a plastic strip, the thickness of a business card and the width of the port ( very important), then stuck it under the USB tongue on the phone. When a cable is inserted into the phone it connects and charges every time. Have been dong this for 9 months now and waiting until contract is up to get an updated phone, 7 months to go!