If your on a tourist exemption or DTV or Toutist visa you most likely won’t be able to open a bank account. If your on a 90 day non o you can open a bank account. If your non on a 90 day non o I think you will have to leave Thailand to apply for one yourself. Or you can use an agent who can sort it out for you. I came in on a 90 day non o and used
@THAI *****************************
to get the 12 month extension. I know people will say just do it your self but I didn’t want the hassle and paid for convenience. I understand they can advise on transferring to the 12 month retirement option and help with bank accounts etc. look on their website or contact them for advice. Other agents offer the same service but I’ve stayed with Thai Visa Centre as I’m happy with their service.