We’ve been starting to hear more about an LTE-Advanced technology called carrier aggregation lately, as mobile operators in South Korea, Australia and the U.S. start rolling out new supercharged networks capable of doubling download speeds to the device. But with an exception or two, carriers are making very little noise about these new capabilities.

I recently reported that AT&T(s t) already has carrier aggregation up and running in Chicago and other cities, capable of boosting its speeds by 50 to 100 percent. But AT&T has publicly made little fuss about it, and it’s only revealed a single device — a 4G hotspot — that can tap the network. We’re starting to take the first steps into LTE-Advanced networking, but the normally self-promoting mobile industry is staying mum. What gives?

Ericsson CEO Hans Vestberg

The explanation, according to Ericsson(s eric) CEO Hans Vestberg: We’re in a nebulous transition period in…