Can I sync iPhone with multiple PCs or Macs?
Yes and no. You may sync each type of data (Contacts, Calendars, Mail Accounts, Safari Bookmarks, Music, Photos, Podcasts, Movies and TV Shows) from a different Mac or PC. But, only one Mac or PC controls each grouping of data; iTunes replaces existing content on iPhone. However, iTunes can merge contacts and calendars (this can take a long time), but the process must be repeated manually each time you switch to a new Mac or PC.