Today it's Kasikorn. 6 months from now it could be SCB. If international transfer is important to you, use swift directly from your bank in home country. FX providers (like Wise or Remitly) will always shuffle things for greatest profit. Your needs are secondary if you're lucky. The international transfer designation had nothing to do with Bangkok bank. They received the money as a domestic transfer. It was Wise who made the change.
they are a star alliance member and I've flown them before. I fly from west coast, usually SFO and sometimes LAX. Final leg might be Thai Airways from Korea
i did swift transfer from Schwab investment account to Bangkok bank this week. $15 fee and sending in usd converted at ฿31.6. my credit union wants a $60 fee so that changes the equation. Same amount through wise ended up with $26 in fees and exchange rate about the same.
All phone plans here are cheap relative to the usa. Suggest you go to an AIS store and buy an annual pre paid package for data only and just top up every once in a while with ฿100 for calls and txt.