The accepted currency in Krabi and Phuket is the Thai Baht (THB). It is advisable to exchange currency at official exchange counters or banks for the best rates. ATMs are widely available in tourist areas for convenient cash withdrawals. Most hotels, restaurants, and shops accept major credit cards such as Visa and Mastercard. However, it's always good to have some cash on hand for small purchases and street vendors. Mobile payment options such as Apple Pay or Samsung Pay are not widely accepted, so it's best to rely on cash or card payments.