I had to format it as FAT32, you can google for how to do that, but once you do, it works great.  I'll never understand why people would ever buy a phone that doesn't have a microSD slot.  With this you can fill it up with whatever you want, such as movies, TV shows, music, and share it with whoever you want.  Just pop it in your phone and you are all set for a long trip, airplane ride, etc.  I never need to worry about running out of space when taking full HD videos either.