Open Settings
Tap General
Tap About
Find Model Name
Find Model Number
Check the back of the iPhone
Check the SIM tray on older models
Compare the model number with Apple’s model list
Use the serial number on Apple’s coverage page
Look at the iPhone’s physical design
Check the camera layout
Check the screen size
Check the presence of Face ID or Touch ID
Check the charging port type
Check the notch or Dynamic Island
Check the color and finish options
Use the original box if available
Check purchase receipt or carrier records