I can use my Monzo card in a currency exchange both at the airport or on the street in Phuket

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Monzo in Thailand [Discussion]

Used Mondo in Bangkok at a Citibank ATM to avoid charges as spotted by other Mondonauts. I can confirm this was seamless but select the credit option when withdrawing cash and you’ll be fine. To get a near perfect rate is great! Only problem is that there aren’t many Citibanks in Bangkok therefore try and take as much as you can. Uber is also a great save to get you places!