Using iPhone from Australia in Thailand

I am looking to buy a iPhone 4s as a gift for a friend in Thailand will a phone purchased in Australia be suitable or should I purchase it from apple store Thailand


Purchase it from Apple store in Thailand. Should the Australian iPhone
develop an problem requiring repair/replacement, the iPhone would have
to be returned to someone in Australia to take to Apple. Apple does
not accept international shipments for repair nor will it ship out of the
country after repair.