The ACCC has blocked the proposed $15 billion TPG Vodafone Hutchinson Australian Merger.

The competition regulator decided two smaller contenders fighting from different corners, with different techniques, offered a better shot at taking on the industry giants rather than one middle size contender.

In ACCC chair Rod Sims' opinion, TPG is the best prospect Australia has for a new mobile network operator to enter the market, and is likely the last chance Australia has for stronger competition in the supply of mobile services.a