I may be pushing my luck with this question, but it's worth a crack, someone may have been there recently and worked this out.
I'm going to be in Thailand for three weeks in the not too distant future - Koh Samui, Chiang Mai, and Bangkok (yes I know about the protests). Roaming would be prohibitively expensive. Can any one suggest which mobile network is suitable for those locations, and where to get a SIM card for my S4.
I'm hoping for an answer like "buy a DTAC prepaid SIM in Suvarnabhumi airport, top it up by (xyz)". A simple answer would be the DTAC tourist SIM. That pages doesn't specify prices, but there seem to be add-ons here for $2/day, or here for $23/month. They have to be activated though.
Also interested in tips, experiences, etc regarding mobile use over there, and probably any general tips too. I've been there before, but ten years ago.