Phone shows 11 gb is used while only a little over 1 gb is used? I added all up all of the usage data on my iphone 5s(16gb) and it came up to a little over 1gb, while it says 11 gb is used, with only 1.7 gb is free.
You should go to Settings/General/Iphone Storage. It will give you a listing of items on your phone and their sizes. It takes about 15 minutes to create the table so be patient. You can see at bottom of screen that it is working.