Only highest-end iPhone 12 may support millimeter-wave 5G — Apple World Today

5G networks will use both low and high frequencies, but they’re supposed to offer their highest speeds on millimeter waves. Millimeter-wave spectrum is usually defined to include frequencies between 30GHz and 300GHz. But in the context of 5G, carriers and regulators have generally targeted frequencies between 24GHz and 90GHz.

As noted by arstechnica, Millimeter waves generally haven’t been used in cellular networks because they don’t travel far and are easily blocked by walls and other obstacles. 

So is The Information rumor accurate? The Sellers Research Group says that it is. If you live in a densely populated area, millimeter-wave 5G is useful. For others, not so much. Also, the infrastructure for 5G wireless networks needs to employ many more closely spaced base stations than earlier wireless networks, to support the shorter propagation distances of millimeter signals.