What does iPhone5guwb mean? Apple's name department is actually millimeter wave. The American model is exclusive.
My understanding is that the bandwidth is large and the capacity is large. It can be used in an environment similar to Wi-Fi, but the number of clients far exceeds that of Wi-Fi. Such as sports fields and large places: barrier-free environment with huge flow of people.
For example, in foreign football fields, 4G often crashes, and WI-FI certainly crashes. Even if it doesn't collapse, it's turtle speed.
At present, the only confusion is whether millimeter wave is castrated by hardware, or whether they all have the same ability, but software restrictions and even publicity differences.
5. Can China be used? Yes
This year, iPhone 12 still fully supports the 5G networks of China Mobile, China Telecom and China Unicom, so you can support iPhone 12 no matter which operator's 5G package you use. However, it should be noted that the iPhone 12 mini with the smallest screen does not support dual cards, and only one SIM card can be inserted. Other models support dual cards, so pay special attention when purchasing models.
One reason why China doesn't deploy the faster millimeter wave 5G is that in the initial stage of commercial use of 5G, the coverage below 6GHz is larger, and it can be directly installed on the basis of 4G base stations, thus improving 5G coverage, saving costs and facilitating network popularization.
Second, because the penetration of millimeter waves is really poor. The electromagnetic wave wavelength of millimeter wave is only1-10 mm. If you know it a little, you will know that the shorter the electromagnetic wave wavelength, the worse the penetration ability. In real life, not to mention the wall, a leaf or a piece of paper can completely block millimeter waves.