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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.

No, iOS 18.3 doesn�t install Starlink on your iPhone – here�s what the latest update does, and why you should download it

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.

iOS 18.3 Software Update Screen on an iPhone

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.

iOS 18 Carrier Settings

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.