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Apple is right in optimizing the LTE technology to the maximum. For one, there is no 5G as of today. There is no standardization of this new 5G tech yet, no two companies are talking about the same thing when they are talking 5G. Two, the cellular towers that are required to propagate and conduct the 5G signals are not yet installed and won’t be until 2019-2020. Therefore, what you are seeing in the news or reading in the articles are nothing but marketing stunts with experimental devices and a couple of testing stage cellular towers.
Personally, my two cents, 4G LTE-advanced is going to be the leading technology for quite a while supporting gigabit speeds. 5G has some major standardization and technical problems to overcome like the higher frequencies allocated under 5G unable to travel farther and unable to travel through the walls, thus limiting it’s effectiveness in deployment. Future is combining and layering radio technologies like 5G alongside 4G and using MIMO, multiple liquid crystal antennas, more bands and more carrier aggregation. Just think of 5G as more stronger radio waves, which can also have a potential impact on your brain. So keep your tin foil hats ready and drink more water. After all, microwaves at your home are nothing more than 6G frequencies operating above 100Ghz of electromagnetic radiation spectrum, while 5G will be just under 100Ghz.