What are the best phone service options for expats visiting Thailand for two weeks?

For expats visiting Thailand, purchasing a local SIM card is highly recommended for phone service. Options include buying a SIM card package at the airport, but it's often cheaper to get one from a 7/11 store. Popular providers mentioned include AIS, DTAC, and True. AIS is noted for best coverage but may be pricier, while DTAC tends to be cheaper with lesser coverage. Some respondents also suggested using travel platforms like Klook for discounts on SIM cards. For those with unlocked phones, eSIMs can also be a convenient option if set up prior to the trip.