hello,we have been using sandisk memory cards since the beginning of sd cards.  this latest version was recommended for my samsung galaxy 4s phone.  with the zillion photos, videos and apps, the original 16/13gb of space was becoming full and not saving due to "lack of space."  so, the sandisk micro sd card was the answer.  pop the back off easily on the phone, slip the mini sd card into the provided slot, make sure it "clicks" in and put the phone cover back on the unit.  it is as simple as that.  now, i have 32 gb of extra space and my new phone stores anything i want to store.  (i constantly make backups to my home computer...very easy)  the connection simply shows the phone data and the sd card data when connected to the home computer.  i transferred my largest photo/video file to the sd card.  now the original 12gb is open for more instant quality photos and videos.  when the original card gets loaded again.  13meg camera takes super quality photos and videos, but also takes up a lot of space.adding a micro sd card is less expensive than ordering a 32gb galaxy4s, but yrmv  great productupdate...  the original "super large" file that is on the sd card still shows up on the original gallery screen.  it still has the same functions, but my original 16gb shows more room for the next zillion photos, etc.