iPhone hardware
The iPhone is a collection of modules, chips, and electronic components from different manufacturers. Due to the complexities of the iPhone, the list of hardware components is extensive. A detailed list of iPhone hardware components is defined at https://viaforensics.com/resources/white-papers/iphone-forensics/overview.
The following images show the internals of the iPhone 5S. The images were taken after dismantling the iPhone 5S. Internal images for all iPhones can be found in the teardown section from http://www.ifixit.com/Device/iPhone.
And the following is the image showing the back of the iPhone 5S: