Phones contain several identifiers, and confusing them can cause problems during registration, repair, insurance or a used-phone purchase.
IMEI
The International Mobile Equipment Identity identifies cellular equipment. It is normally 15 digits.
Serial number
The manufacturer assigns the serial number for production, warranty and service records. It is not the same as the IMEI.
ICCID
The ICCID identifies a physical SIM card. Replacing the SIM changes the ICCID, not the phone IMEI.
EID
The EID identifies eSIM hardware on supported devices.
Mobile number
The mobile number identifies the subscription number used for calls and messages.
Why record both IMEI and serial number?
The IMEI is important for network and lost-device workflows. The serial number supports manufacturer and warranty records. Keeping both strengthens ownership documentation.
Used-phone checks
Compare identifiers across Settings, box, invoice and seller records. Investigate every mismatch before payment.
Frequently asked questions
Is IMEI the same as a serial number?
No. IMEI identifies cellular equipment, while the serial number is assigned by the manufacturer.
Can a phone have two IMEIs?
Yes, many dual-SIM phones have two IMEIs.
Does changing the SIM change the IMEI?
No. The SIM and device identifiers are separate.
What is ICCID?
ICCID identifies the SIM card.
What is EID?
EID identifies eSIM hardware on supported devices.
Which identifiers should I record?
Record IMEI 1, IMEI 2, serial number and purchase details.