The following is an overview of the 3G data plans available by big three cellphone networks in Thailand. Outside of the 3G coverage areas you can expect EDGE coverage across Thailand. Note as of Jan 2013: Currently DTAC and True Move H are clear leaders in country-wide 3G coverage.
Covers major regions in Thailand at a maximum speed of 42 Mbps. Check all coverage areas.
799 baht / mo | 3GB of 3G. Unlimited EDGE after that. | Unlimited Wifi | Press: *133*24#
Coverage Map: Major cities in Thailand
Most Popular package:
650 baht / mo | 3GB of 3G. Unlimited EDGE after that. | No Wifi | Press: *104*23*9#
Other Thai 3G networks and resellers: