What are the best methods for UK expats in Thailand to access UK bank accounts and manage mobile contracts?

UK expats in Thailand can easily access their UK bank accounts through online banking. Most banks allow the use of a Thai address without issues. Maintaining a UK mobile number is possible through services like giffgaff or by downgrading to a low-cost plan, with users typically sending a text every few months to keep the service active. Many expats successfully receive one-time password (OTP) codes for transactions on their Thai SIMs, but this can depend on the bank's policies. A dual SIM phone can facilitate using both UK and Thai phone numbers simultaneously.