In the 1990s phone companies became ISPs
In the 2020s Mobile Network Operators will become ISPs

eSIMs are like a bus ticket to ride the Internet

1990s: telephone companies became ISPs
2000s: television cable companies became ISPs
2010s: wireless telecoms became ISPs
2020s: space rocket companies became ISPs

A doodler and computerer. I like permissive/permissionless open source, smart contracts, p2p systems, room-scale VR, and NixOS.

shazow.net

Currently: WhatsABI

This timeline is a bit better than mine. 

And the eSIM is the ticket to access it all.
With a T-Mobile eSIM, you can connects to:

5G Towers
5G WiFi hotspots
5G Satellites

Yea, that's more of a consumer-centric view than provider-centric. T-Mobile only owns one of those.