And, BTW, some people wrote that if the phone number registered in your bank is not in your name, the bank will "close your account and keep the money"... FAKE ! the bank will just suspend the Mobile Banking...
USEFUL INFOS : regarding Name / Phone number : "Foreigners are required to present their passport when purchasing a True Mobile pre-paid SIM card in Thailand. This is because Thai regulations mandate that all SIM cards must be registered with the user's identification details, and for foreigners, a passport serves as the primary form of ID"
If one has not activated the international roaming at a True Office BEFORE leaving Thailand, one cannot roam outside Thailand. Most people forget to do it it seems.
If there is money on your account, the bank has not cancelled the account. But you must visit your branch in order to get a new debit card. It takes 10 minutes and cost about 200 baths.
Especially when they have to deal with people who are kind of arrogant... All over Asia. This is cultural. Respect and humility is the key in Asia. Then, everything is easy. 😉