I purchased this memory card for use in a Galaxy S2 smart phone.  Music stored on the card plays without problems.  Works great and while not the cheapest, the price was not bad.********Update 11-28-12*********After about 1 month of use, the card failed.  After a few emails to SanDisk, they issued and RMA and promptly provided a warranty replacement.  On the whole great service.  These things are tiny and some failures are expected, so as long as this one keeps working, I still give it 5 stars.