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Wouldn't it be possible with ssh -R ?

The device connect remotely to a server that you control and give access back to you.

https://man.openbsd.org/ssh#R

Or setup wireguard and forward PUBLICIP:PORT to PHONE_WG_IP:PORT

T-Mobile has open ports on IPv6 (at least as of a few months ago). I was curious, and tried hosting a web site from my phone, and it worked flawlessly (assuming you are willing to abandon IPv4).

Well, if you don't mind really slow bandwidth, you can set up a Tor onion service