on the iPhone it's one and the same. My purpose is that I want to keep more information on my iPhone, i.e. there are times when I'm not on fast internet (LTE or WiFi) and I want to be able to access my music and books at that time. I do have the mophie space pack for extra memory, but since only the mophie app can access that memory and the app is very limited, it doesn't really work well for me.
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