I'm about to buy an iPhone off a friend. How should I tell him to prepare it? I won't have access to my computer for another month (I'm visiting this town) but I want to start using this phone right away. So if I start using this phone for a month, download apps, put in contacts, put in calendar events etc, will I lose all of this when I get him and sync with my computer? It's going to ask me to "replace" all content on the phone first time I sync right? Any way around this?