I posted before what I wanted to transfer my prepaid True number to DTAC. Today I inquired again at the DTAC Support Center and was told what i can finally do it, but only at Bangkok DTAC offices. Only passport is needed and the process takes 2-3 days. No SIM replacement necessary, you will be notified by SMS when the transition is approved. So I would definitely do it when I am in BKK next time.

Just asked the DTAC call center operator when I would be able to transfer my True mobile number to DTAC and he said it probably will be possible around December 15. Happy to hear that as I am really fed up with True’ poor coverage and data services.

According to the article in Bangkok Post, it might be soon possible to transfer a mobile number between Thailand mobile phone operators – AIS, DTAC and True.