How can I open a bank account in Bangkok without a visa or a fixed address?

Opening a bank account in Bangkok without a visa or fixed address is challenging but not impossible. Most banks require proof of address, which can be a lease or a residency certificate from your embassy. Bangkok Bank is mentioned as one of the few banks that might allow account openings for tourists under certain conditions. Some users reported success in opening accounts with just a passport and no proof of address, but this may depend on the specific branch and can vary by time. It's generally advisable to be present in Thailand and have an established address, even temporarily, to navigate the banking system more effectively.