tripper1000:
Most of the ideal frequencies for mobile devices are already spoken for, so with 5G they are looking at using less ideal microwave frequencies. There is a lot of bandwidth available in these bands, but the trade-off is that the range is shorter or building penetration worse. This likely means cells will be smaller and cell sites will be denser, meaning they can reuse the larger bandwidth more times over than with present bands.
Spark demonstrated hitting 20Gbps over 5G a few months ago on their test equipment. To do this requires 800MHz of spectrum - to compare this to existing 3G and 4G networks it's significantly more spectrum than VF, Spark and 2degrees own at present for all of their 2G, 3G and 4G networks.
Battery life on 5G will also be poor compared to existing 3G and 4G, the first real 5G device got announced last week (but won't ship until 2019) - it's a clip on module for the Moto Z3 that launches next week. The module will have the 5G radio and a huge battery pack to power it!