HT4623 am getting message thay my Iphone can not be used in my itunes because need version 1.6.3 or later but my phone says my operating system up to date. How get my phone recognized in itunes

I am getting a message thay my Iphone can not be used in my itunes because I need version 1.6.3 or later but my phone says my operating system is up to date. How do I get my phone recognized in itunes?