There is no such thing as an “international version” iPhone. All iPhones are made for sale in specific countries or areas to comply with local technology standards. A warranty is only valid in the country where the phone was intended to be sold by Apple or an Apple authorized reseller. Beware of “gray market” phones that are sold by independent or non-authorized resellers. These are frequently imported by the merchant from the US or other countries, and they are not covered by Apple’s warranty outside of the original country of sale.