Chris Prescott
This card worked in my Galaxy S3 right off the bat.  I did not need to format it or anything.  After about 2 weeks, I was watching a video on my phone and it locked up.  Then the phone showed that the card was damaged.  Now I am unable to copy anything over 100mb to or from the card.  Viewing photos from the gallery also locks up the phone.  Amazon customer service is great, however.  They sent me a new card.  I will update my review after I am able to use the new one for at least a month without any errors.****UPDATE****After having the second card for a few weeks, it also had the same issues.  Even worse, the card was completely unreadable after it locked up.  The card showed about 5 GB of data being used, but could not be accessed via the phone or in a computer.  Sent this one back and will be going back to my trusty 16GB card.