All we're left with is a serious case of the blues.

Standing next to its sibling, iPhone 5s, the colorful 5c case looks very similar in structure.

The most noticeable difference is (unsurprisingly) the material.

The less visibly noticeable difference is weight: A greater mass of plastic is required to match the strength and durability of a lesser mass of aluminum. The 5c rear case is way heavier: 43.8 g vs 25.9 g for the 5s.

Nestled within the polycarbonate backing, is a steel frame that serves as an antenna and structural support.

As we approach the end of our teardown, we think we have solved the mystery of iPhone naming convention: and here it is.