iphone 5s 64 gb and 30gb is used for "other"
i just got a 64 gb iphone 5s and it is saying that 30 gb is used for "other" and theres nothing on it but music and thats in a seperate category
iPhone 5s, iOS 7
That would suggest you have 'corrupt' data on your phone. It may be a good idea to set your phone up as new. You will have to find a way to move your contacts over (unless they are synced with contacrts on a Mac) you could use air drop, then sync music, apps etc from iTunes but that should cure the issue.