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I wonder if this would this apply to MVNOs who use the TMobile\Sprint network?

That would mean Google Fi VPN wouldn't work.

I was using my own always-on VPN w/ GrapheneOS on T-Mobile's network and was having tons of problems with calls and texts not getting through.

This does not seem to be the case. Elsewhere in the comments, neurobashing said their private relay works fine for an MVNO on T-Mobile.