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A 'US-Made iPhone' Is Pure Fantasy
(www.404media.co)
This is a most excellent place for technology news and articles.
By "nonstandard SIM" do you mean one of two common SIM sizes that are not "nano", which is preferred by current phones?
GNSS means it's global. Which includes US GPS, as well as Europe's Galileo, Russia's GLONASS, and China's BeiDou. Wikipedia
Fair, apparently at some point I conflated GNSS and Galileo.