There’s a decent chance it’s in the US. But it’s by no means a safe assumption that someone using an iPhone and writing in English is automatically in the US.

With the other context I agree that it’s 99% likely to be the US. But the iPhone barely plays a role in that. Like I said, most iPhone users don’t live in the US. Most people arguing about 2 weeks notice in English with their boss probably do.

I was just being a bit overly pedantic, is all.