I am using DTAC  and would like to know how I can know my data usage so I know when I am near my limit.There is nothing from DTAC to indicate it. Is their an app I must use? Also how to track how many call minutes used? Also nothing from DTAC to indicate it.

If you have an Android phone, download the DTAC app from the play store.  It shows all of that information.  Assume there is also an iPhone app, but don't know about it.

DTAC Happy USSD Codes

Adding *9 returns English language.  So *101# would give a Thai message. *101*9# would be in English.

• Check your remaining balance – Press: *101*9#  or *101# 
• Check your add on credit – *101*1*9#  
• Check your Internet credit – *101*4*9# 
• Check your SMS credit – *101*2*9# 
• Check your Happy for free credit –  *101*5*9# 
• Find out your phone number –  *102*9# 
• Check your Promotion – *103*8*9# 
• Switch plans IVR – *1003 press 9 
• Current and last month’s usage – *108*9# 
• Emergency refill service – Press *110*9# 
• Press : *113*[number of days 30/90/180]*9#    Example: *113*180*9#  for  180 day extension.
• Wrong number Refund service – *111*9#  – IVR:*1011
• Emergency Call Me Back service – *114*10_digits_number_you_want_to_contact*9#  or IVR:*1490
• Turn on IR (International Roaming) – *118*9#  or *1018 
• Turn off IR – *118*2*9# 
• Check IR roaming status – *118*3*9# 
• Check the price of a call to any country – 004 international_number_to_call 
• Credit Transfer Service – *112*10 digits Happy Number*amount*9#  (Amounts: 20-200 Baht, 2 baht fee)  or  IVR: *1411 
• Live Thai to  English translation service: IVR: *1021  press 9
• Check remaining balance of your internet package – *101*4*9# 
• Check if the number is in DTAC network – *102*1*08XXXXXXXX*9# 
• Activate/Deactivate Happy internet – *104*71*9#  (Activate)  *104*72*9#  (Deactivate)
• Use credit topup code – *100*card number,refill code*9#  

https://play.google.com/store/apps/details?id=th.co.crie.tron2.android&hl=en

 

(You need to be on mobile data, not WiFi for the Android app to work.)

 

https://my.dtac.co.th/esv/en/login?ref=current-usage-summary

 

Web-based, enter phone number, wait for 4 digit code.

 

USSD codes above are for pre-paid. Post-paid codes are here: https://www.dtac.co.th/en/postpaid/services/dtacnumber.html