IMEI vs Serial Number: What Is the Difference?

IMEI vs Serial Number: Key Differences

Both IMEI and serial numbers uniquely identify a smartphone, but they serve different purposes and are used differently in device verification. Understanding which to use — and when — makes IMEI checking more effective.

IMEI Number

• Format — 15 digits, standardized globally by GSMA
• Purpose — Identifies the device to mobile networks; used for blacklisting and carrier lock tracking
• Scope — Global. Recognized by carriers worldwide.
• Found via — *#06#, Settings, SIM tray, box
• Used for — IMEI checks: blacklist, carrier lock, TAC model lookup

Serial Number

• Format — Alphanumeric, manufacturer-specific (e.g., Apple uses 12-character serial numbers)
• Purpose — Identifies the specific unit for manufacturer warranty, repairs, and service records
• Scope — Manufacturer-specific. Apple serial numbers only work with Apple systems.
• Found via — Settings → About, box, device back (some models)
• Used for — Warranty checks, Apple GSX, service history

When to Use IMEI vs Serial Number

• Blacklist check — Always use IMEI
• Carrier lock check — Always use IMEI
• Apple warranty check — Use serial number at checkcoverage.apple.com, or IMEI via IMEI Check Pro Apple GSX report
• Model verification — Either works; IMEI is more standardized