"Great Card"

This is one of the better reviewed SDHC Class 10 cards that utilized UHS. By reading the reviews you will see that it reads/writes at a better speed than many or most cards out there right now. Much depends on your phone, how your phone's OS stores information on a card and what's inside your device. For MOST of us; you probably will not notice anything different between this card and any other GOOD quality card out there. I usually pick the fastest cards on the market when the prices drop. The main problem, speed related is when you transfer large amounts of data (usually music) onto any card. If you use a standard USB 2 connection this card won't speed that process up. If you use a USB 3 or if you actually put this card into a USB 3 reader to do the transfer; then you'll see a nice boost. If your device requires a card that the product can UTILIZE and has the OS and chipset to take advantage of this FAST card; it's a no brainer. If your device is older, if you just like storing music; then you can find a cheaper good quality card. If you find this at a good price no matter what you have... BUY IT