These are the 3G/4G data plans available by AIS, DTAC and True, the 3 major networks in Thailand.  4G trials have started in small areas, and outside of the 3G coverage areas you can expect EDGE coverage across Thailand.

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AIS 12Call

Covers major regions in Thailand at a maximum speed of 42 Mbps. Check all coverage areas.  To get AIS  Wifi Password dial *388# to get a username / password via SMS. Quick Start:

799 baht / mo | 4GB of 3G. 256 kbps after that. | Unlimited Wifi | Press: *777*334#

AIS 3G 2100 ais 3g data package       ais netsim package 12call monthly data 3g plan

 

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DTAC Happy

Coverage Map: Major cities in Thailand. Most popular data package:

650 baht / mo | 3GB of 3G. Unlimited EDGE after that. | Wifi | Press: *104*23*5720283*9#

Type
Package Details
Period
Auto Renew
Price Not including 7% VAT
EDGE Speed
Sign Up Code
Unlimited Packages
1 DayDaily DTAC Happy Internet: 150MB max 3G speed (prepaid only)daily49 Baht384 Kbps*104*29*5720283*9#

1 WeekWeekly DTAC Happy Internet: 1GB max 3G speed (prepaid only)6 months199 Baht384 Kbps*104*28*5720283*9#
MonthlyMonthly DTAC Internet: 750MB max 3G speed12 months299 Baht64 Kbps*104*353*5720283*9#
MonthlyMonthly DTAC Internet: 3GB max 3G/4G speed6 months399 Baht128 Kbps*104*21*5720283*9#
MonthlyMonthly DTAC Internet: 1.2GB max 3G speed, Unlimited Deezer Music12 months449 Baht384 Kbps*104*553*5720283*9#
MonthlyMonthly DTAC Internet: 6GB max 3G/4G speed + free dtac wi-fi6 months650 Baht384 Kbps*104*23*5720283*9#
MonthlyMonthly DTAC Internet: 12GB max 3G/4G speed + free dtac wi-fi6 months799 Baht384 Kbps*104*343*5720283*9#
MonthlyMonthly DTAC Internet: 5GB max 3G speed + free dtac wi-fi12 months890 Baht384 Kbps*104*22*5720283*9#
Volume-based Packages(get allowance to use 3G at max speed of 42 Mbps)
75 MBDTAC Happy Internet 75 MB (prepaid only)7 Days49 Baht42 Mbps*104*252*5720382*9#
250 MBDTAC Happy Internet 250 MB (prepaid only)7 Days79 Baht
42 Mbps*104*253*5720283*9#
100 MBDTAC Internet 100 MB30 Days
99 Baht42 Mbps*104*25*5720283*9#
500 MBDTAC Internet 500 MB30 Days 199 Baht
42 Mbps*104*26*5720283*9#
1.5 GBDTAC Internet 1.5 GB30 days 349 Baht42 Mbps*104*254*5720283*9#
2 GBDTAC Internet 2 GB30 days 549 Baht42 Mbps*104*255*5720283*9#
Time-based Packages(3G speed is at rate 384 Kbps)
3 hrsDTAC Internet 3 hrs. (prepaid only )7 days15 Baht
384 Kbps*104*30*5720283*9#
5 hrsDTAC Internet 5 hrs. 30 days50 Baht384 Kbps*104*11*5720283*9#
20 hrsDTAC Internet 20 hrs. (on demand)30 days valid99 Baht384 Kbps*104*12*5720283*9#
70 hrsDTAC Internet 70 hrs. (on demand)30 days valid199 Baht384 Kbps*104*13*5720283*9#
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DTAC Internet Packages for smart phones, ipads, tablets, pocket wifi, and 3G modem.  

TRUE MOVE H

Coverage: All major destinations. Voice Packages here. Quick start:

799 baht / mo | 3GB of 3G+. | Unlimited Wifi | *900*3379#

true move 3g true-movepackage

TRUE MOVE

Note: True Move SIMs are being replaced by True Move H sims. If you need data, ignore True Move. Quick start:

699 baht / mo | 3.5GB of EDGE. No 3G. | Unlimited Wifi | Text “V3″ to 9789

Other Thai 3G networks and resellers