Some users have reported problems connecting the S3 to a USB 3. 0 port. Try connecting it to a USB 2. 0 port if the S3 isn’t showing up.
Swipe down from the top of the screen while your S3 is connected to your computer. Tap “Connected as” and select “Media device (MTP). " Your device should get recognized in Windows.
You can check your version of Windows Media Player by clicking the Help menu and select “About. "
You can download the USB drivers from Samsung’s S3 Support page. Click the “USB (ENGLISH)” button and run the installer after downloading it.
If you can’t get your S3 to exit Download Mode, take the battery out and then reinsert it.
Sprint - ##3424# Verizon, AT&T, T-Mobile - *#22745927, tap “Hidden Menu Disabled,” then tap “Enable. " Open the dialer again and dial **87284 US Cellular - *#22745927, tap “Hidden Menu Disabled,” then tap “Enable. " Open the dialer again and dial *#7284#
You can insert an SD card by removing the battery on the back of the phone.
Open the Contacts app. Tap the “Menu” button and select “Import / Export. " Select “Export to SD card” and then tap “OK. "