I am about to try to do the same, just waiting a little bit till the exchange rate becomes a bit better again. It seems that doing it via Wise is the best (Bangkok Bank - > Wise -> My Swiss Bank), as they have the lowest fees (?) and the best exchange rate (?)... To be seen....
Yes. That's why I kept my old phone and when I want to connect to Bangkok Bank, I put my SIMs back into my old phone and it contininues to work. You might have to go back to your branch and they will sort it out.
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