Optus owns and maintains the largest fleet of satellites across Australia, but at the same time the number-two telco can't rival its larger competitor Telstra for mobile network coverage in rural and remote parts of Australia. It makes sense, then, for Optus to boost its coverage in black spots using a series of small cells -- lower-powered portable radio nodes that are much easier to install than a full mobile tower -- that connect to its satellite network. And that's exactly what the company is doing.