5G is almost here. In the US, the big four carriers will all start rolling out different bands of 5G networks in 2019 and 2020, and that 5G infrastructure will get faster and more advanced amid an explosion in 5G-enabled devices.

For now, carriers like T-Mobile are already rolling out low-band 5G networks and bands specifically tuned for Internet of Things (IoT) devices. T-Mobile gave PCMag an exclusive tour around its 5G Experience Truck, which demonstrates how 5G reduces latency and how the technology will power a future filled with IoT devices and smart cities.

PCMagazine also got a closer look at some of T-Mobile's 5G network hardware, which is being built by both Ericsson and Nokia (in this case, Ericsson).

Before the demos, PCMag chatted with Tom Ellefson, T-Mobile's SVP of NE Engineering and Operations. Ellefson detailed the various levels of T-Mobile's 5G rollout plans, explained why low latency is so critical, and talked about the 5G applications and devices with the most potential.