The payment for the so-called remedy period covers October last year, when AIS’s concession under TOT expired, until March 31.

The NBTC ordered AIS to pay the fee within seven days after receiving the order letter on Tuesday. The fee will go into the state coffers.

Recently the National Council for Peace and Order (NCPO) allowed AIS to delay the date on which it will have to switch off its 900MHz service to June 30 this year, from the April 14 deadline set by the Central Administrative Court.

The NBTC then asked AIS to shut down the service on March 15 but AIS sucessfully sought a court injunction, allowing it to extend the deadline to April 14.

Under the NBTC’s new remedy-period regulations, AIS has to transfer the fee during the remedy period at a rate not lower than its fee for the spectrum in the last year of its use.

According AIS’s concession contract, it paid 30 per cent of its total revenue to TOT from its post-paid cellular service and 20 per cent from its prepaid cellular service.

The Bt125-million payment is based on the prepaid rate as all its existing users during the remedy period use the prepaid service.

The NBTC last year asked True Corp to pay a similar fee, as its subsidiary TrueMove had continued to provide the service on 1800MHz to customers until last November after its concession ended in September 2013. The order covered the fee payment from September 2013 to July 2014 and totalled Bt1.069 billion.

Both parties are yet to settle the final amount TrueMove has to pay.