i would suggest dtac, buy any dtac sim, u can subscribe to *104*397*9# 10Mbps unlimited quota 39baht/days , or *104*398*9#199 baht/weeks, can even buy extend validity @ *113*30*9# 30days cost 2 baht, *113*60*9# 60days cost 4baht, *113*90*9# 90days cost 6 baht, *113*180*9# cost 12 baht,

just simply buy a sim without any data, top up the dtact sim then buy the data plan manually yourself is much cheaper,..dtac also have unlimited @ speed 512Kbps, 1Mbps, 2Mbps or 4Mbps,.. i personally prefer the 10Mbps,..

So far I only use dtac since is Digi sister company, no matter 3G or 4G I get max 9-10.5Mbps at most time regardless of what band they are on, quite impressive their connections is 90%+ stability if compare to our Digi or other malaysia ISP. Unlimited quota plan all come with capped speed, so choose the speed u want, if quota plan, they are more than 90Mbps for sure if your phone support 4G+ in Thailand band.

Nope, it is not possible.