What does this device do exactly? i went into the Verizon store and i was inquiring about the note 5 64gb(white) which is supposedly not going to be carried by them...anyways, the guy was telling me this could work if i wanted to go with the 32GB and it would work for added storage purposes? Im confused as to what it does because he didn't give me much info and couldn't tell me anything more than that...so if someone could give me a rundown that would be great!!