PBA chief executive Jonathan Withers said the company was yet to finalise dates for the launches, which would be in the second half of the year. "You always have to be pretty vague because just getting the sites can be variable in time," Mr Withers said.

PBA, the licensed carrier that owns and operates the iBurst wireless internet network, would also consider moving into regional areas, he said. Adelaide and Perth would complete iBurst's coverage of major metropolitan centres on mainland Australia. Unwired, which recently expanded from Sydney to Melbourne, has also promised to launch in other major capitals, but it is yet to provide a firm schedule for its plans.

The two companies want to win the loyalty of wireless internet users before the second half of 2007, when Intel is expected to start building chipsets for portable computers capable of connecting to WiMax networks. Unwired, which is focused on the consumer market, had 48,434 customers at the end of March.

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