you fucking idiot, it's NEVER EVER EVER coming to the US.
NEVER.
a 25% increase in cost is still MUCH more preferable to bringing all of that shit to the US. probably by orders of magnitude. can you even fathom (of course you can't) what you would need to do to have a 100% American iphone?
let's say you're bringing the iphone manufacturing plant to the US. let's even assume this move is subsidized so the new factory is going to cost only time.
the iphone isn't put together from mere atoms. parts of it need to be manufactured first. there's the screen, the glass, the aluminum case, several cameras, the battery, the ram, the storage, the CPU, the GPU, the receiver, accelerometer, gyroscope, etc etc... how much of that shit do you think is made in the USA?
so there's tariffs an all of that. or to avoid them you need to make several new factories, and have other companies that provide these things also move their factories... and these factories don't just have people create electronics by hand. you need machines. where do you think those are made? who makes them? so now you need the manufacturers of manufacturing robots to move their factories to the US.
and all these factories now employ people with much higher salaries.
all in all, a move like that would halt production for years and when it comes back every iphone would probably cost $47000.