Works great in my Verizon Samsung Galaxy S3. The only thing I found that didn't work was trying to transfer my files using a USB MicroSD card reader. When I used this USB Reader it copied my files but the phone didn't show them or couldn't write to the card. I had to put the microSDXC card in the phone and copy my files the slow way using the USB cable. The card does run hot when copying files to or from it. That would be normal I assume with it being Class 10. Best bang for the buck IMO. I would buy another one if I needed it!