Among those 11 million users, 5 million are customers of Advanced Info Service, 4 million are with Total Access Communication (DTAC) and the rest with TrueMove H.
The NBTC claims that the strict regulation that all prepaid mobile-phone users must use their identity cards to register their SIM cards is due to national-security concerns.
There are 110 million mobile-phone subscriptions in Thailand, of which 85 million numbers are for prepaid services.