There are three major mobile network operators in Thailand, all offering nationwide coverage. In 2023 DTAC and TrueMove H merged under True Corporation, but both brands still operate separately for prepaid customers.

Major carriers

• AIS (Advanced Info Service)
  Thailand's largest carrier. Brands include 1-2-Call and Serenade.
  
• DTAC (now part of True Corporation)
  Popular for prepaid and Happy tourist SIMs.
  
• TrueMove H (now part of True Corporation)
  Widely used for prepaid data plans and tourist SIMs.
  

Active MVNOs

• FINN Mobile (formerly Line Mobile, under True Corporation)
  

Top up Thai carriers on MobileTopup

MobileTopup supports instant prepaid top-ups for AIS, DTAC, and TrueMove H. Visit the Thailand top-up page, enter the phone number, and we detect the carrier automatically.

Closed carriers

The following Thai carriers and MVNOs have shut down or been absorbed into other operators:

• MyCAT (from CAT Telecom) — CAT merged into National Telecom (NT) in 2021; MyCAT SIMs are no longer sold.
• I-Kool (under TOT) — TOT merged into National Telecom (NT) in 2021; I-Kool service discontinued.
• Penguin SIM (under CAT) — discontinued after the NT merger.
• Mojo 3G — closed.
• 168 Communication — closed.
• Samart I-Mobile (under TOT) — closed.
• TOT 3G — absorbed into National Telecom (NT).