From a TMobile Engineer:
“The TMO 5G network is currently IPv6 only. NSA (not SA) should be used in situations where IPv4 is needed.
Also our b2b.static APN is also IPv4 only at this time.
The devices connecting to either the fast.t-mobile.com(phones, tablets, MI hotspot plans) or fbb.home (Business Internet plans) APN’s using Dynamic IP addressing would need to be set to NSA and IPv6/IPv4 for the PDP.”
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