I use a
16GB Sandisk on my phones its only class 4, but that will work. The class information as i know it is in relation to how fast the card will read/write. For my phone speed is not relevent. For my Gopro camera however I was basically forced into buying a class ten or
EXTREME as its called. I always go with Sandisk or Samsung as the names are very reputable and trusted. I've also heard some horror stories about the cheaper brands.