yeah, you need to make sure that in your camera settings, it is set to save to the sd card. i find that this is one of the most common memory uses. each picture taken is a significant file size. if you're not saving them to the sd card, then switch it now and move the stored pics somewhere (back them up to your pc or dropbox or wherever you store pics). videos and music as well. the operating system does take up a decent amount of space and there's simply nothing you can do about that. also, if you have a music subscription service like spotify, and you download music, it doesn't actually give you the option to use the sd card because you don't actually own that music. it will only download to that particular device (your phone) and will eat up a lot of memory.