Is Iphone included in tariffs?
As of April 2018, the tariffs are targetted at products in which Chinese companies dominate.  They would apply to products made by American companies in China and imported to the US, but the exact products covered have been chosen to minimise this effect.  Nevertheless,


  it will most likely increase costs for American manufacturers that depend on imported parts because it concentrates heavily on machinery and high-tech components.


In other words, US firms that use components made in China by Chinese companies as inputs in creating more complex products will be harmed.  For instance, Harley Davidson have said that


  Import tariffs on steel and aluminum will drive up costs for all products made with these raw materials, regardless of their origin.