The Information and Communications Technology Ministry recently agreed to transfer 5MHz of 1800MHz bandwidth from both CAT Telecom and DTAC to the NBTC.
Meanwhile, CAT Telecom is still considering whether to take further legal action against the NBTC for holding the upcoming 1800MHz licence auction.
Last year, CAT filed a lawsuit at the Central Administrative Court against the auction plan, claiming that it held the rights to the 1800MHz spectrum licences until 2018.
CAT granted 1800MHz concessions to TrueMove and Digital Phone Co. The concessions expired in September 2013.