Cash vs foreign exchange/card
Keep enough Thai Baht (THB) for markets, small shops and backup. For cards, check your own foreign-exchange markup, ATM fee and overseas-cash-withdrawal charges before assuming a “travel card” is cheapest.
₹ Saver: compare the total fee, not just the advertised foreign-exchange markup.
Can you use Indian UPI?
Unified Payments Interface (UPI) can work at participating cross-border merchants, but acceptance is not universal. Keep cash/card backup and confirm the amount/currency before approving a QR payment.
Cash-machine (ATM) withdrawals on Indian cards
Your cost can include a Thai cash-machine (ATM) fee, your Indian bank's overseas withdrawal fee, foreign-exchange markup and taxes. Fewer sensible withdrawals can be better than many small ones.
SIM card / eSIM
Need data immediately? Use airport Wi-Fi first when available, message family/check your transfer, then compare eSIM or a physical tourist SIM. Keep your passport ready for physical SIM registration.