Well if we could splurge a bit, and if people felt home sick this is an option: ACeS - (Asian Cellular Satellite) Service Provider have coverage over the area we are going to, we can use the The

"Ericsson R190 pocket phone weighs just 210 grams, so for the first time this phone can be used for GSM and satellite calls without being too bulky. The R190 operates as a GSM or satellite phone or with GSM or satellite preferred; the phone will automatically switch to the
alternative network if the preferred mode is not found."