Hello
I am using an ais travelsim from Thailand with unlimited data for over 100 countrys.
http://www.ais.co.th/roaming/sim2fly/en/
You can book the datapackeges here
https://thaiprepaidcard.com/3g-data-...dtac-and-true/
You can do it with dtac too
https://www.dtac.co.th/en/prepaid/pr...urist-sim.html
It is working brilliant.