The telecom regulator on Monday approved 3G License bidding by three top mobile phone operators. Advanced Info Service PLC or AIS, Total Access Communication Public Company Limited or DTAC and TrueMove, all of which are 2G license holders have been given the green light to participate in the 3G license bidding by the National Telecommunication Commission (NTC). The NTC said that the three mobile service companies were eligible to bid in the first round of the third-generation mobile- phone technology license auction which will take place on 20 September in central province of Prachuap Khiri Khan. The bidding will be broadcast live on television, the National News Bureau of Thailand or NNT said. The NTC is planning to accept tenders from other interested bidders and hold the second round of the 3G license auction in the next few months after the first lot has been sold off, the NNT said. 