i dont quite know all i know is you will need one for a ipod tough and shuffle.
Go To Setting On Your Iphone And Scroll Down You Should See Store And Than You Sign Out Old One And You Resubmit Your Email For Itunes And Password.
Plug your iPhone into your PC and open itunes, click you device and click summary.
I don't no how!
Yes. You can sign up for an iTunes account for free. You'd have to use a mobile device or a computer to use it, though.
i had the same problem. first i Erase All Content and Setting on my iphone in settings/General/Reset and erase all content and settings. (you will loose all content on your iphone) connect to itunes...