Hi I got an iPhone 4 a while a go and I have 16 gb capacity but I have downloaded heaps of apps and put about 600 music on it and I have 800mb left but when I update on app store it says that I don't have enough space left to download when I have enough left to download it why does this happen and when I go on itune it say what has filled my iPhone it says apps8.2 music 5 and other 600 mb what is the other and how do I get rids of it