I thought if you buy applecare it was covered internationally? At first it was just on macs but I thought they extended it to iPhone's as well.
I had Applecare + on my iPad 3 that I purchased while I was working in New York, had it replaced under the 1st year's warranty no issues.
My phone didn't have AC+, but was still replaced under the year's warranty in the UK.
I can't find it now, but there's an Apple document somewhere that basically says "mobile" devices have international warranty (so iPhones, iPads, laptops & iPods) are covered internationally.