If you are a recent iPhone user you will find my practice very useful: I’ve noticed since 2008 my iPhones’ performance goes down considerably when having the storage memory filled near full capacity. I started using the same PC storage drive practice on my iPhones by using no more than 50% of max capacity, and that keeps the performance of my iPhones the same as it was new right out of the box the day I bought them. However, there are times I nearly fully loaded the iPhones with apps, audio, video and pics, but, then I transfer the files to my computer soon after I get home. I keep only the apps in use for that season: ie. Sport tournament apps etc. I also clear out the Social App documents that can accumulate into many GigaBytes! Only videos, pics and voice memos I want to use and possibly alter with an app filter for a social network remain on the iPhone. Same with songs. I don't keep my music library on my iPhone, just a few play lists for the season, mood, workouts or travelling. Christmas is coming so Frank, Dean and Michael (Buble) will be added to get into the spirit of Christmas before snowfall.