So my friend @Matt_P was on a car ride and somehow is getting 4G+, which is in Korea (also a few other countries) and I’m pretty sure the band it’s on is reserved for them only, and is illegal in America to broadcast on that band.
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I think it is a gimmick, I have 4G+ too and it doesn’t have any speed improvement
I had the 4G+ thing show up too, no changes
sounds like my country… Uses 4G but with the speed of 3G, and recently, some carriers are announcing they have 4.5G 
which is still 4G but with a little more speed
my iPhone says AT&T 5G, but, hell, it’s not faster or better at all, ffs