Thailand's telecoms regulator NBTC has issued an order requiring AIS and True Move to provide low-cost 4G SIMs for disabled and low-income citizens.
The order is based on the terms of the licenses for 1800-MHz and 900-MHz 4G spectrum won by the two operators in an auction last year, the Bangkok Postreported.
As per the order, low-cost 4G SIMs must provide tariffs at least 10% cheaper than the maximum cap on 4G voice and data tariffs imposed by the regulator.
Caps in the 1800-MHz and 900-MHz bands have been set at 0.69 baht ($0.019) per minute for voice calls and 0.26 baht per megabyte for data services.
The new low-cost SIMs will need to be available by March, and the operators will be required to design a process to meet this deadline.
The NBTC is yet to set definitions of disabled and low-income for the purposes of determining eligibility for the discount plans, but has suggested that low-income may be defined as earning less than 10,000 baht ($281) per month.
According to NBTC secretary-general Takorn Tantasith, last year's 900-MHz and 1800-MHz auctions had the explicit purpose of bridging the digital divide, and all Thais must be able to benefit from national resources including spectrum.