T-mobile has 110 million subscribers and the population of USA is 329 million people.
Ubiquity means “everywhere”
So not only do you have a less than 50/50 chance of seeing an iPhone, it certainly isn’t everywhere.
Especially for fashion statements like iphones. (Doubt this? Upthread people are discussing how certain affluent neighbourhoods only have iphones).
You could potentially control the situation enough where a user can enable “satellite mode” which uses extra power for sending messages. It’d affect battery life, and need to be manually enabled, but it’d enable better connections in emergencies.
You could try to improve directional antennas and some sort of aiming system with the screen.
Lots of things that maybe could happen when you control the client side instead of just the satellite side.
They want this as a differentiator from Android. Starlink will work on Android too.
So maybe it would actually make sense for Google to partner with them somehow (I believe they’re also a SpaceX investor) but I’m not sure how.