Buy Internet SIM at 📍AIS (Terminal 21)

I think AIS is the most expensive, and also the widest coverage. At airport it is 999B/30Days/10mbps. In town it is In town it is 700B/30Days/4mbps. There is also 49B registration fee. Don't don't seem to offer their cheaper monthly packages to tourist. The is also an online e-sim package for 899B/30Days/50GB.