5G is coming, and with it, the promise of faster internet that will support innovations like streaming virtual reality, self-driving cars, and smart home and city infrastructure. But before it rolls out to the masses, critical infrastructure details will need to be ironed out—for instance, what radio frequency bands telecommunication companies can use for this new technology. That’s a decidedly unsexy detail, and one most people don’t think about much. We want our radio and TV broadcasts and cellphone reception to just work. Who cares how? But now might be a good time to start caring. New technologies will require frequency bandwidth, leading to clashes between new, shiny innovations and older technologies we still need but take for granted.