This was my first time adding an SD card to a Smart Phone. I just got a Nokia Lumia 1520 and with such an excellent screen I wanted to be able to play movies on it for trips or to watch at my desk while working.So far I have put 6 albums and 6 Hi Def movieson the card and still have 20gb to spare. Everything loads up just as fast as if it was stored on the phone's internal memory.Very happy with this little guy.