The iPhone is identifiable by its distinct hardware features. If you examine your iPhone, you should see a "sleep/wake" button on the top-right corner, a "Home" button centered beneath the screen, and a ringer switch and volume buttons on the upper-left side. Additionally, your iPhone should have an Apple logo imprinted on the back. If any of these components are missing or present in a different location, it's likely that your iPhone is a fake.