But safe! Getting a SIM card in Hua Hin, Thailand is quite easy. Since Hua Hin is a popular tourist destination, many stores sell SIM cards for tourists, including at the airport and in stores like 7-Eleven. These SIM cards often come with a preloaded data or calling credit. However, in order to use a Thai SIM card, your phone must be unlocked. You often have to show your passport when buying such a card.