Some quick research yields that
many satellite phones use the L band frequencies. As to satellites, many phones use the low earth orbit (LEO) satellite systems of Iridium, which provides wordwide coverage with 66 LEO satellites, or Globalstar, which provides service everywhere except polar regions with 48 LEO satellites.
Discover the key features of the satellite network on which your satellite device will run, which is essential when selecting the best Satellite device for your needs.
www.bluecosmo.com
New model iPhones, which currently have limited (but expanding) sat communication abilities, currently use the
Globalstar network of satellites and Apple is buying 20% of Globalstar.
Google Pixel 9 cell phones have begun satellite communication using
Skylo's sytem of
eight rented geocentric orbit satellites owned by other companies.
The following Musk Starlink site says that "Starlink satellites with Direct to Cell capabilities enable
ubiquitous access to texting, calling, and browsing wherever you may be on land, lakes, or coastal waters, and that "Direct to Cell works with existing LTE phones
wherever you can see the sky. No changes to hardware, firmware, or special apps are required, providing seamless access to text, voice, and data." It also says that Starlink satellites with a special modem on board will first have to be "launched on SpaceX’s Falcon 9 rocket and then Starship. On orbit the satellites will immediately connect over laser backhaul to the Starlink constellation to provide global connectivity." This implies to me that none of the current Starlink satellites can be used for the planned Direct to Cell service.
Seamless access to text, voice, and data for LTE phones across the globe. The Starlink Direct to Cell launch campaign is underway.
www.starlink.com