Talk:Thailand/@comment-117.192.42.151-20150130184559/@comment-110.77.211.194-20150218165128

Yes, sim bought anywhere in Thailand is valid all around the country. There will be no roaming charges when you use them outside Bangkok. For operators, to get most covergage for voice AIS gives you the best coverage. However those two proviences that you will visit are already in coverage in all of the major network operators. So there is no difference in those coverage. To be sure, if you are "always on" type of person I did suggest you to use DTAC or TRUEMOVE H for 3G. AIS are still lacking of many 3G cellsite in rural area. But in the city centre. There is no worries.