been attempting to sort thru the phone issue. i have an iphone6 with ATT...but the rates for out of country use are laughable. should i just buy a cheap phone on arrival, and change sim cards as i travel thru the region, or is there one carrier that covers the lao, cambodia, vn , thai , malay areas inclusive without needing to change sim cards? also see conflicting tales of buying sim cards. data cards. etc......anyone with knowledge gets a free beer on me when i get there...lol