We are preparing to launch our high-speed 4G service ahead of AIS to fight for a bigger market share," said Thiti Nantapatsiri, group executive director of True Corporation. True now operates 4G service on the 10 MHz band of the 2100-MHz spectrum, launched two years ago. The company will roll out its 4G service on 15 MHz of the 1800-MHz spectrum next week. "We have a combined 25 MHz of operating bandwidth for 4G commercial service, compared with AIS having only 15 MHz," he said. True is now the operator having the highest amount of 4G bandwidth. Mr Thiti said as True Move was the first operator to introduce 4G, the company has early experience in the market and has implemented market pre-entry strategies. TMC yesterday handed the National Broadcasting and Telecommunications Commission (NBTC) two bank guarantees worth a combined 21.3 billion baht for the outstanding half of its 4G licence fee.