"There is no universe in which Apple snaps its fingers and begins making the iPhone in the United States overnight. It could theoretically begin assembling them here, but even that is a years-long process made infinitely harder by the fact that, in Trump’s ideal world, every company would be reshoring American manufacturing at the same time, leading to supply chain issues, factory building issues, and exacerbating the already lacking American talent pool for high-tech manufacturing. In the long term, we could and probably will see more tech manufacturing get reshored to the United States for strategic and national security reasons, but in the interim with massive tariffs, there will likely be unfathomable pain that is likely to last years, not weeks or months.
The truth is that, assembled in the U.S. or not, the iPhone is a truly international device that is full of components manufactured all over the world and materials mined from dozens of different countries. Apple has what is among the most complex supply chains that has ever been designed in human history, and it is not going to be able to completely change that supply chain anytime soon.
We can see how the iPhone is made today by looking at numerous reports that Apple puts out every year, which outlines its current supply chain and workforce requirements"
https://www.404media.co/a-us-made-iphone-is-pure-fantasy/