The number the bank have must be registered as proof its your and mustbbe a Thai number, every bank the same.

You cannot get a bank account anymore on a tourist visa, this is to ensure that non residents of Thailand cannot access thai banks remotely.

If your new phone number is thai you phone or go into their shop, they will text you a official ceryificate that it is registered to you, print and take with passport to bank.was your account not frozen like most people? Mine was untill i proved i lived here on a long visa and the number is registered.