If it is not one of the newer ones it maybe only has 802.11n radios. The numbers you see are slightly low but it may depends on the exact model of iphone. There are lots of other things that affect wifi performance. at least as long as it wasn't apple that invented it. Apple in particular does not support things that are proprietary. In addition to get the 600 number they are using a data encoding method that is not part of the wifi standard. Almost every end device only has 2 so it will only run 2x2 or 1x1 if there is only 1 antenna. To even attempt 3x3 mimo you must have 3 antenna on both ends. If this was actually true they would just use 100x100 mimo. Next to get numbers like 600mbps they assume you can use 3 over lapping signals with no loss. Wifi unlike ethernet is half duplex so it can't actually do transmit and receive at the same time. They have added the transmit and receive speeds together kinda like calling your 100mbps ethernet 200mbps. So addition "lies" that affect your rates. Those numbers are not actually speeds they more represent the data encoding. You now must learn all the other lies they tell to get those numbers. At least you know about lie number 1 where they add the 2.4g and 5g speeds together.
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