Pre Paid SIM Cards in Southeast Asia
A good option for travelers to Southeast Asia is to get an unlocked phone with a pre paid SIM card in your destination country. The SIM card is a unique feature of GSM phones, and this transferable smart card holds all the phone settings and serves as authorization for your phone to access local networks.
This card can be switched between phones, and pre paid SIM cards can be purchased in every Southeast Asian country that offers GSM cell service. It is as simple as buying a SIM pack and inserting the card into your unlocked phone. Pre paid SIM cards come with a loaded balance which is included in the package price. The balance is used up as you make calls, and the rates are included with the SIM card you purchase. It's possible to reload or "top up" this balance with scratch cards from which can be purchased at many locations.