Well some parts you can guess on your own also ... for example after checking my stock of 5 iphones (from different shops) ...
C3 - Obviously the factory, China
The next 6 characters seem to be alphanumeric counter with no special significance
The next 3 on all my phones are the same so they should have some meaning, cant seem to think of what
The last digit again is random which would be in sync with the above 3 static letters
------------------
I had done this analysis for HTC One, because I was compiling the complaint for the Purple Tint issue on the camera and its serial number system is fairly simple ..
First 2 letters to denote factory (SH,HT,FA)
Next 2 letters the week of mfg
The rest of the letters are counter for the unit number