iPhone 4

The 30-pin connector is one of the most interesting parts of the iPhone 4. With the dock connector inserted in charging port, it brings the iPhone to life. When you take the port out of the iPhone you get to see all the parts that make it work. It's a black rectangle that has a lot of wires and metal pieces within it. Apple claims to manufacture this piece themselves, however, Apple's list of suppliers has been taking off their website, so this information is solely based off of other sources. 

You can click on the image below to see it more in-depth.