Is ICCID the same as your phone number?

No. ICCID identifies the SIM card hardware itself, while your phone number (MSISDN) is a logical number assigned by the carrier. You can change your phone number while keeping the same SIM card (same ICCID), and vice versa.

ICCID is printed on the plastic card frame of your SIM. You can also find it in iPhone Settings → General → About, or Android Settings → About Phone → Status → ICCID.

FAQ Knowledge 2026-08-05 · IMEICheck Editorial Team · 6 min read

What Is ICCID? SIM Card Unique Identifier

Q: What does ICCID stand for?

ICCID stands for Integrated Circuit Card Identifier. It is a 19-20 digit number that uniquely identifies every SIM card worldwide.

Q: Can ICCID be changed?

ICCID is written into the SIM card during manufacturing and cannot be modified by users. Getting a replacement SIM card will give you a new ICCID.

Q: What is ICCID used for?

ICCID is used for SIM activation (carriers link your plan to the ICCID), number porting (verifying SIM identity), and SIM authenticity verification.

ICCID is the unique "ID card" of your SIM. Understanding its structure and purpose helps you better manage your SIM card and identify legitimate carrier-issued cards.

ICCID Definition and Meaning

ICCID (Integrated Circuit Card Identifier) is a globally unique 19 or 20-digit number stored in the chip of every SIM card, uniquely identifying that SIM card. While IMEI identifies the device and IMSI identifies the subscriber, ICCID identifies the SIM card itself as the physical carrier.

When you get a new SIM card from a carrier store, the ICCID is already written into the chip by the SIM manufacturer. When the carrier activates the card, they link your phone number, plan, and account to this ICCID. All subsequent network authentication and service management use the ICCID as the key index.

ICCID vs IMEI vs IMSI

Code	Identifies	Digits
ICCID	SIM card hardware	19-20
IMEI	Phone device	15
IMSI	Subscriber identity	15

Analogy: ICCID is the "SIM card's ID," IMEI is the "phone's ID," and IMSI is "your identity" in the carrier's system. All three are needed to complete a call or data session.

Frequently Asked Questions

Q1: What does ICCID stand for?

Integrated Circuit Card Identifier — a 19-20 digit number uniquely identifying each SIM card worldwide.

Q2: Is ICCID the same as my phone number?

No. ICCID identifies the SIM card; your phone number is a logical carrier-assigned number. They are separate identifiers.

Q3: Can ICCID be changed?

No. ICCID is written during manufacturing. Getting a replacement SIM gives you a new ICCID.

Q4: Where to find ICCID?

Printed on the plastic SIM card frame. Also in iPhone Settings → General → About or Android Settings → About Phone → Status.

Q5: What is ICCID used for?

SIM card activation, number porting identity verification, and verifying whether a SIM card is legitimately carrier-issued.

Check Your Device with IMEICheck

Enter your IMEI for a complete device report including model, carrier, and SIM lock status.

Free Check