iPhone with Globalstar are not satellite phones. They are phones with satellite. They are only text messengers similar to the SPOT and Iridium ones. Starlink is starting with text but planning on doing voice and slow data.
There is a big jump from going from device that have to pay for and pay subscription to working with every iPhone for free. Nobody knows if partner providers will charge extra for service or not but it should be free.
iPhone with Globalstar is absolutely a satellite phone. They've added a satellite phone to the regular cell phone. That's different than what Starlink is doing which is broadcasting a regular cell phone signal.
Which "it" are you talking about? Apple added Globalstar antenna in iPhone 14 so it works with any newer iPhone. If you are talking about Starlink Direct-to-Cell, it will work with any phone with 5G and 1900 MHz band.
For Starlink Direct-to-cell, they are partnering with mobile providers, like T-Mobile in the US. I can't find it, but my understanding is that it will be included in the service. It will be incentive for people to use T-Mobile.
Based on some googling, the latest iphone is 15, so that means it works on 2/15ths of iphones, or an even smaller fraction if you count all the variants apple has released.
If we're looking at non-iphones, the fraction likely gets even worse. Remember 3g was only shut down a couple years ago. And this requires 5g to work? As in 2 entire generations newer?
But yeah, I also haven't found any confirmation it would be free for T-Mobile customers (who have the right phones), so I think it's safe to assume it won't be until we get that. It'd be cool if true, though!
There is a big jump from going from device that have to pay for and pay subscription to working with every iPhone for free. Nobody knows if partner providers will charge extra for service or not but it should be free.