Upgrading Apple iPhone4 to iPhone 5

My apples account is not recognizing my iphone4 when I try to sync. I have also been unable to update my iphone4 to ios5 because of this. When I purchase iTunes songs on my iPhone, the cloud automatically transfers them to my iPad, however, when I purchase on my iPad, they are not being transferred to my iPhone. When I sign into my apple acct on my computer it is just recognizing my computer
