It was just once when Apple released C series of iPhone as iPhone 5C. It was wrapped in Polycarbonate body that was released in September 2013. Apple used iPhone 5 hardware in iPhone 5c that was released a year back. iPhone 5C is also known as affordable iPhone that was available in various colors.
This year we expected Apple to announce iPhone 6c along with iPhone 6s and 6s Plus, but this didn’t happen. However, rumor about iPhone 6c has not stopped so far. So many Apple fans still expect an iPhone 6C.
If iPhone 6c is launched, Apple would certainly use iPhone 6 hardware. So you can expect a 4 inches HD display, 1.4 GHz dual-core Apple A8 chipset, Finger Print Sensor, 8-megapixel rear and 1.2-megapixel front camera (If only iPhone 6c rumor turned into real).
There is no official confirmation on iPhone 6c, but we have got some concept videos of iPhone 6c. The concept is actually an expectation from the designer how they think iPhone 6c may look like.