On older models, it was printed on the back. On newer ones, you might find the serial or model info etched inside the SIM tray. The "Secret Code" Decoder Ring
The Ultimate Guide to iPhone SKU and Model Lookups Every iPhone carries a unique identity through its SKU (Stock Keeping Unit) and model number. Understanding how to find and decode these identifiers is essential for verifying authenticity, checking warranty status, or identifying specific regional hardware differences. How to Find Your iPhone SKU and Model Number The "SKU" model number is the long alphanumeric string that typically indicates the device's specific configuration, including storage capacity, colour, and region. Open Settings iphone sku lookup
Are you curious about a specific code you found on your device, or Identify your iPhone model - Apple Support On older models, it was printed on the back