Who I have the same questioned this topic

I am getting about 300 mps download speed for my new 5G home internet.  But when I do a speed test on my iPhone 13 Pro Max standing right next to the Verizon cube I get north of 500mbs.  (Just ran it and got 659 mbs) What gives?  Now at @25/month 300mbs is probably going to work (I am testing it for a month) but I was very excited when I saw the UW next to the 5G on my phone and ran a speed test.  Seems the cube should be at least as fast as my phone?