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The sim card will come with minutes but you can purchase extra credit when you buy it, or at a 7 eleven. No, a taxi driver definitely won't accept USD. Make sure you always have smaller notes for taxi journeys. They don't carry huge amounts of change, so if you try to pay for an 80 baht taxi fare with a 1000 baht note they won't have enough change. 7 elevens always have plenty of change, so just buy a drink or something cheap there to get some smaller notes from a 1000. You get charged every time you use an atm there - by the Thai ATM (they charge 200 baht per transaction) and by your bank back home who will charge you a fee. So you might as well take a larger amount out, seeing as you get charged anyway. I think the most you can withdraw from an ATM in one hit is 20,000 baht. Otherwise it's a 24 hour airport so there'll be somewhere open to change USD.