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Best answer
10
SIM card buy Phuket airport before van Khao Lak — AIS True DTAC 299–599 baht tourist 30 day arrivals 7-Eleven register passport. Highway signal patchy AIS slightly better coast. Bang La On 7-Eleven backup if forgot. Grab tour booking needs Thai number day one. eSIM Airalo works secondary. Do not wait remote Bang Niang unless Bangkok SIM already.
3
True Bang La On — staff registered passport 10 min after van drop.