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Lets unpack this ahead.
However, its not on by default and is only engaged when no LTE or Wi-Fi connection is available.
Since then, some carriers have offered satellite networks alongside a typical phone online grid.
T-Mobile is doing that, and it initially announced its partnership with Starlink in August 2022.
Apple also updated a support pagedetailing how to turn off carrier-powered satellite features.
To do this, open options, navigate to Cellular, select your carrier, and turn off Satellite.
Simply, though, iOS 18.3 does not install Starlink on the iPhone.
T-Mobile is also the only cellular data pipe in the United States to have this partnership with Starlink.
So, long story short, iOS 18.3 does not add a direct connection to Starlink to your iPhone.
That service has been using Globalstar satellites since its inception.