Talk:Thailand/@comment-195.212.29.174-20150623151857/@comment-24682153-20150623170210

For voice it depends on where are you calling to international. True has rates as low as 1 THB to some European, Asian and American landlines. I'd suggest their tourist SIMs. On the dtac SIM, included credit is only valid for 1 week, but with AIS or True for a month. So it might be the better choice.

The True Tourist SIM value pack for 299 THB has 1.5 GB and 100 THB call credit, which can be up to 100 mins voice depending on your call destination. For this you have to use IDD prefix 00600 (see Basics chapter above). If you need more, you can easily top-up.