Much manufacturing is still done in the US, but our consumption is far greater than what we make.
Lots of specialty electronics is done in the US.
For something like an iPhone, physical assembly is but one small step.
Arguable the best paid jobs for the iPhone are in the US: the R&D.
Specialty stuff, sure, where there's a small market willing to pay high prices for very specialized gear. But we're talking about the iPhone here - it's nothing even remotely resembling niche - they're assembling well over
half a million of them every day - today half a million, tomorrow another half a million... - if you take a day off, you'll need to do well over
one million the next day. It's absolutely mind boggling that they can build such a complex device to such consistently high tolerances, in such enormous quantities. I think most people have
no idea just how massive the manufacturing infrastructure is in China.
And yeah, R&D / software development and such is an area where the US excels, and is generally high paid, but it would be difficult to argue that those are the massive numbers of "factory jobs" / onshore manufacturing that the administration is talking about.
Design and development takes
thousands of people. Assembly (including gathering all the resources and doing all the subassembly) takes
millions of people. And
that is what the administration says it wants to bring to the US. I stand by my assertion that if iPhone manufacturing does return to the US, it'll be in the form of a
massively automated / robotic manufacturing operation that employs thousands of Americans, not the hundreds of thousands or millions that Trump keeps implying (what he's doing is selling a fantasy to a section of the country that feels left behind and wants to go back to an imagined "better time" in the past - like assuring people there will be comfortable reassuring jobs in "clean coal" instead of training them to work in the solar industry, where we're ceding a lot of ground to China - with them not realizing that history only moves
forward, and that that imagined past is a fantasy as well). America doesn't have hundreds of thousands of highly skilled but unemployed machinists and such who are willing to relocate to a newly built factory city. We don't teach those skills to huge numbers of people these days. And spinning up that kind of resource pool is going to take decades, not months (but, sure, let's start the protectionist tariffs now -
facepalm).
Personally, I think Apple would be better off, and more resilient against pandemics, natural disasters, and geopolitics, if it had manufacturing plants (again, probably highly automated) on every continent - less shipping, less importing, and if one facility melts down, others can share the burden. Put a big plant in the US. And another in Europe. And another in South America. And so on.