(Telecompaper) All three biddersOptus Mobile, Telstra and TPG Internethave secured spectrum in the Australian spectrum auction. Four companies initially applied to participate in the auction. However, Vodafone Hutchison Australia withdrew before the auction, which started on 23 April. Optus secured 2x10 MHz of 700 MHz spectrum and 2x20 MHz in the 2.5 GHz band for AUD 649.13 million. Telstra paid AUD 1.30 billion for 2x20 MHz in the 700 MHz band and 2x40 MHz in the 2.5 GHz band, while TPG Internet bought 2x10 MHz in the 2.5 GHz band for AUD 13.50 million.