I have a T-Mobile SIM card on slot A of my Max BR1 mini. Why am I seeing its IP address to be 192.x.x.x ?
Because T-Mobile does CGNAT (Carrier Grade Network Address Translation). The IP address your cell device sees is not the public IP everything on the Internet sees.
Go to a “what’s my IP?” site and you’ll see.
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This is a 464XLAT PLAT address which isn’t CGNAT, though one could argue it’s similar/the same as CGNAT.
TMO runs IPv6-only and, to support IPv4 and dual-stack devices, they use 464XLAT Provider Address Translation (PLAT) to provide pseudo-v4 addresses to your devices.
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That’s a normal public IP 
I can understand the confusion because it looks similar to the defined IP addresses in RFC 1918 (ie 192.168.x.x).
Actually, it’s far from normal It’s reserved per RFC6333 for DS-Lite (464XLAT PLAT) in use by T-Mobile for extending an IPv6-only environment to IPv4-only and dual-stack environments.
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I stand corrected!
Now I get it.
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