you can make your own thai ringtone at www.mixxer.com It depends what service you have. I know for a fact that if you have US cellular than it doesn't work but I'm pretty sure other service let you use mixxer.
cool thanks! ^_^ Though its not free. I suggest D/L a ringtone and graphic program at download.com and make them yourself and upload it to sendspace.com;megaupload;yousendit or any webhost. And type it in your fone and download it. This won't cost money and you won't have to pay anything only for the dowload space and stuff. But if you have internet no worries!