The iPhone arrives with native or built in Apple-branded apps. Unless an iPhone is jailbroken, these apps cannot be removed. Some examples of built-in applications include "Contacts," "Compass," "Settings," "Calculator," "Music" and "Photos." If any these applications are missing, the phone is jailbroken or fake. You can restore the original firmware by entering DFU mode and reinstalling the operating system. If native applications are still missing, then your iPhone is likely fake.