These SanDisk Ultra microSDHC Class 10 cards work great in my Samsung Galaxy Note 8 tablet and my Samsung Galaxy S3 phones. I've also used them in non-smart phones, and they work just as well. Fast write/read speeds are HIGHLY recommended to get the best experience from your gadgets and devices, especially when taking pictures/videos, viewing/editing them, opening/editing files, etc. SanDisk has come a long way in terms of quality and performance, and I would not hesitate to buy more of their cards.