Vodafone  definitely and now optus are talking of boycotting the 700 MHZ radio frequency 4G auctions because the government is asking to high a price.

http://delimiter.com.au/2013/01/09/fletcher-takes-a-big-fat-swing-at-4g-auction/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Delimiter+%28Delimiter%29