What is "Other" in iTunes. Can anyone help me with it? Because last night it was taking up 1.37 GBs but this morning I woke up and all of a sudden it's taking up 4.40 GBs! I even used this app called "Phone Clean" on my computer to delete messages, phone calls, etc. And I only have 10 apps, no videos, no notes, and I don't use email, iCloud or anything. Please help.