How to change what iTunes account is linked to your iPhone or iPad - iMore | Educational Technology in the Library | Scoop.it
If you download apps, movies, and games on your iPhone or iPad, you're already familiar with what an iTunes account is and how it works. However, that doesn't always mean that the email or account you use for mail and iCloud is the same account you use for purchases. If you ever need to change what iTunes account is linked to your iPhone or iPad, you can do so in just a few steps....

Via John Evans