In a pretty inspired move, NVIDIA is using a "software-defined modem" in the Tegra 4i, so these features can be added afterwards with simple software updates. So, instead of just supporting the current 100Mbps LTE, it is now also capable of handling 150Mbps LTE-Advanced service that is expected to start rolling out by the end of the year.
NVIDIA says it is also working on an update to add VoLTE to the 4i, which is also expected to start rolling out on Verizon and AT&T by the end of the year.
A "software-defined modem" seems pretty interesting. It also makes us wonder just how hackable the Tegra 4i could be.
source: The Verge