Residents in Melbourne's CBD and select inner suburbs will have access to Unwired's portable wireless services from Wednesday this week. Coverage will be extended to Clifton Hill, Collingwood, Flemington and North Melbourne in May and rolled out progressively after that.

The mobile wireless provider, which until now only provided services to Sydney, announced in December that it had 42,200 customers.

"We're pretty happy about that and research shows that we are already in the top ten broadband providers in Australia, and that is after only a year and a half operation in just one city," spokesperson Amanda Wallace said.

Unwired owns licenses for the WiMax-ready 3.5Ghz and 2.3Ghz spectrum in most major population centers and some regional areas below Perth, near Geelong and the Hunter valley region.

Wallace said Unwired will continue to roll out its services to other Cities around Australia over the next few years.