On a resent trip to bangkok i purchased a 300p smart in order to use use roaming i turned it on at the Airport BALANCE 260P in Bangkok i made one short tx BALANCE 220P next tx the same 40p when the balance was 160p i turned it off roaming BALANCE 120 P last time i used roaming it was free to turn on and 10p a tx CHEERS Never stand between a dog and a tree