Can I receive a loaner iPhone if I need to send my iPhone in for battery replacement or other service?
Yes. Apple will provide a loaner AppleCare Service iPhone (“AppleCare Service Phone”) while your iPhone is being repaired or serviced for a fee of $29. The loaner iPhone can simply be synced with iTunes in the same way as your own iPhone, and will work and act exactly like your own iPhone, with your own telephone number and all of your contacts, songs, photos, and other data, while your iPhone is being serviced. When you receive your replacement iPhone, you simply sync with iTunes again. Any changes in the meantime will be reflected when you synchronize. See Apple’s iPhone Service FAQ for more information about the AppleCare Service Phone.