Starlink is a fantastic idea for those off the cable internet route, but rather expensive. I have researched it due to having to use Hughes, also very expensive and VERY SLOW compared to Starlink. (That research went away when the cable was brought down the main highway, and I decided to pay a few thousand to get it run to my house, up my driveway).
Have not studied the possible future cellular network off the satellites. But have to wonder what the cost will be. And how the service will work with a cell phone inside a structure. Starlink requires an outside antenna, satellite phones require you to be in site of the sky (I have one and know that for a fact contrary to what they show on TV shows). Therefore, before I would ever jump up and down and infer that due to Musk inventing it, I will jump on the service is a bit premature.
Will it work like a current cell phone...inside structures? If not worthless; sat phone might be better.
If it does work without direct site to a satellite, how much, will the phones be more expensive. (My sat phone was close to 1K and believe me, it is primarily just a phone, not a smartphone with a giant screen to search the internet.
Basically, this idea is just too early and might just be for those extreme rural areas like it is for the internet. That is what starlink was and is designed for and why the gov't gave the subsidies.
I like Musk a very smart guy with great ideas, including how to make money for his ideas from the gov't.
In reality, by the time it gets up and running, who knows; hell I might be dead.