These days, Optus seems to spend most of its money on content deals -- but it's also investing in network infrastructure for the people that need it the most. Optus will build 500 new mobile sites out across rural regional parts of Australia, will upgrade 1800 sites from 3G to 4G, and will boost existing sites with better 4G and small cell satellite coverage at a cost of $1 billion -- the largest regional investment in its 25 year history as a company.