NBN a mistake, says Turnbull, blaming Labor for 'calamitous train wreck'

Prime minister responds to NBN Co chief's concerns the network may never pay its way, due to competition from 4G network

Malcolm Turnbull has labelled the national broadband network a mistake and blamed Labor for leaving the Coalition a "calamitous train wreck" of a project while responding to concerns from the NBN Co chief executive that it may not pay its own way.

Bill Morrow has suggested that competing technologies may hamper the commercial viability of the NBN in the lead-up to an ABC Four Corners investigation, airing Monday night, into the digital divide between premises that get faster fibre-to-the-premises rather than fibre-to-the-node connections.