Here is what i purchased for $49 but i heard that weeks earlier it was going for $38. Works great- Lots of space and fast. One thing i did do after reading in several places was to format it in the phone then use it.

SanDisk Ultra 64 GB MicroSDXC Class 10 UHS-1 Memory Card with Adapter (SDSDQU-064G-AFFP-A)


Amazon.com: SanDisk Ultra 64 GB MicroSDXC Class 10 UHS-1 Memory Card with Adapter (SDSDQU-064G-AFFP-A): Electronics

 

I got this info from a SANDISK CSR via e-mail:


"I understand that you wanted to know that the memory card you mentioned with part number SDSDQY-064G-A11A is of Class 6 or Class 10.I would like to inform you that the mentioned memory card is a class 6 memory card and for class 10 memory card we have part number as SDSDQUA-064G-A11A."

They went on to mention that a very similar # (SDSDQUI-064G-A11A) is also a CLASS 10 card,w/the one letter difference being an internal (SANDISK) marker noting the place & method of manufacture.

The CLASS 10 cards are already formatted to work w/ANDROID devices.Not sure about the CLASS 6 cards.