Few days ago, my friend has introduced a blog to me. This blog made by CU students, she creates software to convert 0X number to 08X and vice versa for any smartphone. I have tested with my Sony Ericsson P900 and it works well.
This is a cool and useful software. Thank you na krub. You can see further information at http://www.nuuneoi.com/projects.php?read_id=1
However, please be awared that you may not send sms to some 10 digits number til this November.