Samsung Galaxy S III User Manual page 24

Important! It is recommended you fully charge the battery before
using your device for the first time.
1. Connect the USB cable to the charging head.
2. Locate the Charger/Accessory jack.
3. Insert the USB cable into the device's Charger/Accessory jack.
4. Plug the charging head into a standard AC power outlet. The
device turns on with the screen locked and indicates both its
charge state and percent of charge.
Warning! While the device is charging, if the touch screen does not
function due to an unstable power supply unplug the USB
power adapter from the power outlet or unplug the USB
cable from the device.
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