ICCID Number: What It Is, Format, and How to Find It (iPhone & Android)

Quick answer: the ICCID (Integrated Circuit Card Identifier) is the unique 19–20 digit serial number of your SIM card or eSIM profile, and it always starts with 89. On iPhone it lives in Settings → General → About; on Android under Settings → About phone → SIM status. The moment you will actually need it: when a support team asks for it to fix an eSIM that will not activate.

Think of the ICCID as your SIM's fingerprint. Networks use it to recognize, activate, and manage every SIM on the planet, physical or digital. This guide breaks down what the digits mean, how the ICCID differs from IMSI, IMEI, and EID, and exactly where to find it on any device.

What Is an ICCID Number?

Every SIM card and every eSIM profile ships with one globally unique ICCID. Carriers use it to tell your SIM apart from billions of others: when your phone connects, the network reads the ICCID to know which account, plan, and country it belongs to.

The format: what each part of the number means

The ICCID follows the ISO/IEC 7812 standard and every section carries meaning:

• 89 — the Major Industry Identifier for telecommunications, always first
• Country code — follows international dialing codes, like 1 for the US or 44 for the UK
• Issuer identifier — which mobile operator issued the SIM
• Account ID — the unique string that separates your SIM from every other on that network
• Check digit — a final digit computed with the Luhn algorithm, the same formula that validates credit card numbers

Read left to right, an ICCID like 8944 10 1234567890 4 decodes as 89 (telecom) + 44 (UK) + issuer code + account number + 4 (check digit).

Most ICCIDs are 19 or 20 digits, but the length can run anywhere from 18 to 22 depending on how long the country code is: a US number (country code 1) sits at the short end, Iceland (354) at the longer one. That last check digit is why a typo never slips through: if one digit is wrong when an ICCID is entered manually, the checksum fails and the system rejects it before anything gets provisioned.

What Is the ICCID Used For?

• SIM identification: the network's primary way to recognize your SIM for routing and billing
• Activation: when a plan is provisioned, the carrier links it to your ICCID, not your phone
• Troubleshooting: support teams use it to pinpoint your exact SIM and run remote diagnostics
• Security: a lost or stolen SIM can be deactivated instantly by its ICCID; fleet and IoT admins block misbehaving SIMs the same way
• Roaming: partner networks read the ICCID to recognize your home network and configuration abroad

Is the ICCID the Same as My Phone Number?

No. The ICCID identifies the physical or digital SIM itself. Your phone number (technically the MSISDN) is a service the carrier attaches on top. The two are linked but independent: one ICCID can carry different phone numbers over its lifetime, and data-only travel eSIMs have an ICCID but no phone number at all.

Does an eSIM Have an ICCID?

Yes. An eSIM is a digital SIM, but the identification system is identical: every eSIM profile you install gets its own ICCID. Install three travel eSIMs and your phone holds three different ICCIDs, one per profile. Most modern phones can store 8 to 10 eSIM profiles, each with its own ICCID, while keeping only one or two active at a time.

With Zyesims, your eSIM's ICCID is in two places from the moment you buy: inside the confirmation email that carries your QR code, and in your phone settings after installation. If you are new to the install flow, see what an eSIM QR code is and how to get one.

ICCID vs IMSI vs IMEI vs EID: Which Is Which?

Four identifiers, four different jobs. Support staff ask for a specific one depending on the problem, so here is the map:

Quick mnemonic: ICCID = the SIM, IMSI = the subscriber, IMEI = the device, EID = the eSIM chip. The EID deserves its own explainer, and we have one: EID number explained and where to find it.

How to Find the ICCID Number

The fast way: dial *#06#

On many phones, typing *#06# into the keypad instantly pops up a device-info panel with your IMEI, EID, and often the ICCID, no call is placed and nothing is charged. It is the quickest check, but not every model lists the ICCID on that screen, so if it is missing, use the Settings route below, which always works.

On an iPhone

1. Open Settings → General → About
2. Scroll down to the SIM section
3. Physical SIM shows under ICCID; an eSIM shows under Digital SIM, one entry per installed profile

On an Android

1. Open Settings → About phone
2. Tap Status or SIM status (some models: SIM cards & mobile networks)
3. Look for ICCID or SIM card number

Without touching the phone

• Physical SIM: the ICCID is printed on the card and its carrier packaging
• Travel eSIM: check the provider's confirmation email, or open your account and copy it from the eSIM's details page — Zyesims includes the ICCID with your QR code in both places
• IoT and fleets: the AT command AT+CCID over a serial interface returns it, and carrier device-management portals list it per device

When You Will Actually Need It

For most travelers the ICCID stays invisible until something needs fixing:

• An eSIM will not activate — support asks for the ICCID to check the profile's status on the network. Start with our checklist for when an eSIM is not working, then contact support with the ICCID ready
• Transferring a number or plan — the carrier identifies the exact SIM to move service from
• Multiple eSIMs installed — the ICCID tells support which of your profiles to look at

Having it ready turns a back-and-forth support ticket into a two-minute fix.

Conclusion

The ICCID is a small detail that quietly runs your mobile connection: a 19–20 digit fingerprint starting with 89 that identifies your SIM or eSIM profile everywhere in the world. You will rarely think about it, but knowing where it lives, Settings on the phone, or the confirmation email of your Zyesims eSIM, saves real time the day activation support needs it.

Frequently Asked Questions

What is an ICCID number?

The ICCID (Integrated Circuit Card Identifier) is a unique 19–20 digit number assigned to every SIM card and eSIM profile. It always starts with 89, the industry code for telecom, and works like a serial number that identifies your SIM on mobile networks worldwide.

Is the ICCID the same as my phone number?

No. The ICCID identifies the SIM card itself, while your phone number (MSISDN) is a service the carrier assigns on top of it. One ICCID can be linked to different phone numbers over its lifetime.

Does my ICCID change, or is it permanent?

The ICCID is fixed for the life of that specific SIM or eSIM profile and never changes on its own. What changes is which profile you use: install a new eSIM and it comes with its own new ICCID, and deleting a profile retires its ICCID for good. So one physical SIM keeps a single ICCID forever, while a phone that has held several eSIMs has carried several ICCIDs, one per profile.

Does an eSIM have an ICCID too?

Yes. Every eSIM profile gets its own ICCID, just like a physical SIM. If you have several travel eSIMs installed, each one has a different ICCID. You can see them in your phone settings, and providers like Zyesims also include the ICCID in the confirmation email with your QR code.

Can I track a lost phone using the ICCID?

No. The ICCID identifies the SIM, not the device's location. Tracking a lost phone works through the IMEI and your carrier or a service like Find My. What the ICCID does allow is for your provider to quickly deactivate a lost SIM so nobody runs up charges on it.

Is it safe to share my ICCID number?

Share it only with your carrier or eSIM provider's support team, who legitimately need it for activation and troubleshooting. Do not post it publicly: while it exposes no personal data by itself, it can be abused in SIM provisioning attempts. Treat it like any other device identifier.

Read More

• EID Number Explained: How It Works and Where to Find It
• eSIM QR Code: What It Is and How to Get It
• My eSIM Is Not Working: Causes and Fixes