What is EID? eSIM and Embedded SIM Explained

What is EID?

EID stands for Embedded Identity Document. It is a unique 32-digit number that identifies the eSIM (embedded SIM) chip inside a mobile device. Just as every phone has a unique IMEI number for network identification, every eSIM chip has a unique EID for eSIM profile management.

The EID is permanently embedded in the eSIM chip's hardware during manufacturing and cannot be changed. It serves as the identifier that carriers and eSIM management platforms (like Apple's eSIM activation, Google's eSIM management, or Samsung's eSIM service) use to remotely provision and manage cellular profiles on the device.

As eSIM technology becomes the standard—with Apple's US-market iPhone 14 and later being eSIM-only—understanding EID is increasingly important for device management, troubleshooting, and cellular activation.

EID Structure

The EID is a 32-digit decimal number structured as follows:

1. Issuer Identifier (IIN) — First 8 digits

Identifies the eSIM chip manufacturer and the eSIM issuer. This is similar to the TAC code in IMEI—it identifies who made the chip and for which market.

2. Individual Chip Identification Number — Next 18 digits

A unique serial number that distinguishes each individual eSIM chip from all others manufactured by the same issuer.

3. Check Digit — Last 6 digits

Used for error detection and verification. These digits are calculated based on the preceding digits using a specific algorithm.

What is eSIM?

eSIM (embedded SIM) is a digital SIM technology that replaces the traditional physical SIM card. Instead of inserting a plastic SIM card into your phone, the SIM functionality is built directly into the device's hardware as a small embedded chip.

How eSIM Works

With eSIM, you don't need a physical SIM card from your carrier. Instead, the carrier sends a digital eSIM profile to your device over the internet. This profile contains all the information needed to connect to the carrier's network—essentially the same data that's stored on a physical SIM card, but in digital form.

The eSIM chip can store multiple profiles simultaneously (typically 3-5), allowing you to switch between carriers or plans without changing physical cards. This is especially useful for:

• Traveling internationally (add a local carrier plan without buying a physical SIM)
• Having separate work and personal numbers on the same device
• Switching carriers without waiting for a physical SIM to be mailed
• Devices too small for a SIM tray (smartwatches, tablets)

eSIM Activation Process

1. Purchase an eSIM plan from a carrier or eSIM provider
2. Receive a QR code or activation link
3. Scan the QR code or follow the link on your device
4. The carrier provisions the eSIM profile to your device using the EID
5. The eSIM profile is activated and your device connects to the network

eSIM vs Physical SIM

EID vs IMEI: What's the Difference?

EID and IMEI are both unique device identifiers, but they serve different purposes:

• IMEI identifies the device (the phone itself) on cellular networks. It's used for network registration, blacklist tracking, and device identification. Every cellular device has one (or two for dual-SIM).
• EID identifies the eSIM chip within the device. It's used for eSIM profile management—activating, deactivating, and switching carrier profiles. Only devices with eSIM capability have an EID.

A phone with eSIM has both an IMEI and an EID. The IMEI is linked to the device's modem hardware, while the EID is linked to the eSIM chip. They are independent—changing carriers via eSIM doesn't change the IMEI, and the EID remains the same even if you switch carriers.

For comparison with other identifiers, see our guides on what is IMEI and what is MEID. You may also be interested in what is ICCID for physical SIM card identifiers.

How to Find Your EID

You can find the EID on your device:

iPhone

1. Go to Settings → General → About
2. Scroll down to find EID
3. Tap and hold to copy the 32-digit number

You can also find it by dialing *#06#—the EID is displayed alongside the IMEI on eSIM-capable iPhones.

Samsung Galaxy

1. Go to Settings → About phone → Status information
2. Look for EID in the list

Or dial *#06# to see both IMEI and EID.

Google Pixel

1. Go to Settings → About phone → SIM status
2. Look for EID

On the Device Packaging

The EID may also be printed on the original device packaging, typically near the IMEI and serial number on the barcode label.

Which Devices Support eSIM?

eSIM support has become common in modern smartphones. Here's a list of major devices that support eSIM:

Apple

• iPhone XS, XS Max, XR and later
• iPhone SE (2nd gen and later)
• iPhone 14 and later (US models are eSIM-only)
• iPad Pro (3rd gen and later), iPad Air (3rd gen and later)
• Apple Watch Series 3 and later (cellular models)

Samsung

• Galaxy S20 series and later
• Galaxy Note 20 series and later
• Galaxy Z Fold 2 and later, Z Flip 2 and later
• Galaxy Watch (cellular models)

Google

• Pixel 3 and later (varies by carrier)
• Pixel Tablet

Other Brands

• Huawei P40 series and later (varies by region)
• OPPO Find X3 and later (varies by region)
• Motorola Edge series (varies by model)

The Future of eSIM

eSIM is rapidly becoming the standard for mobile connectivity. In 2022, Apple made the bold move of releasing eSIM-only iPhone 14 models in the United States, eliminating the physical SIM tray entirely. Other manufacturers are expected to follow suit.

By 2026, eSIM adoption has accelerated globally:

• Most major carriers worldwide now support eSIM activation
• eSIM-only devices are becoming more common, especially in the US and Europe
• eSIM transfer between devices is becoming seamless (Apple's eSIM quick transfer)
• Travel eSIM services (like Airalo, GigSky) make international data affordable
• IoT devices increasingly use eSIM for connectivity

However, physical SIM cards are not dead yet. Many regions (especially in Asia and Africa) still rely heavily on physical SIMs, and some users prefer the flexibility of being able to easily swap SIM cards between devices.

Common Issues and Troubleshooting

When dealing with 手机-related matters, you may encounter these common issues:

Issue 1: Inaccurate or Missing Query Results

Possible causes and solutions:

• Database update delay: GSMA and carrier databases may have a 24-48 hour update delay. Try querying again later.
• IMEI input errors: Ensure you enter the 15-digit numeric IMEI without spaces, letters, or special characters.
• New device models: Recently released models may not yet be in all databases, resulting in limited information.

Issue 2: Inconsistent Results Across Platforms

Different IMEI checking platforms use different data sources (GSMA, carrier databases, manufacturer databases), which may yield varying levels of detail. Recommendations:

1. Use GSMA database results as the authoritative source for model identification
2. Use carrier database results for blacklist status verification
3. Use manufacturer official results for warranty status
4. Cross-reference multiple data sources for comprehensive assessment

Issue 3: Abnormal Status in Results

If query results show "unknown" or abnormal status, it may indicate:

• The device may be a grey-market or refurbished phone from unofficial channels
• The IMEI may have been tampered with or cloned (common in counterfeit phones)
• The device is from a different region not covered by local databases

Real-World Case Studies

Advanced Knowledge

Understanding these advanced concepts will help you better understand 手机-related topics:

IMEI Number Structure

The IMEI (International Mobile Equipment Identity) consists of 15 digits divided into three parts:

• TAC code (first 8 digits): Type Allocation Code, identifying the device model and allocator
• SNR code (middle 6 digits): Serial number, identifying the specific device
• Check digit (last digit): Validates the IMEI number's legitimacy

The TAC code precisely identifies the phone's brand, model, and production batch. GSMA manages all legitimate TAC codes globally.

IMEI and Phone Security

The IMEI serves as a phone's "ID number" and plays a crucial role in:

• Anti-theft protection: When a phone is stolen, carriers can blacklist the IMEI to prevent network access
• Authenticity verification: Genuine phones have IMEI records in the GSMA database; counterfeits often use cloned or invalid IMEIs
• Warranty verification: Manufacturers use IMEI to check activation date and warranty status
• Used phone transactions: Buyers verify the device isn't blacklisted via IMEI

Practical Tips and Precautions

Here are practical recommendations regarding 手机:

1. Backup your IMEI: Record your phone's IMEI in a safe place for future reference
2. Always check before buying: Whether new or used, verify the device status via IMEI before purchase
3. Keep purchase receipts: Purchase receipts and warranty cards are important for consumer protection
4. Protect your privacy: Don't enter your IMEI on untrusted websites; choose reputable checking platforms
5. Understand regional differences: IMEI registration and blacklist rules may vary by country

Frequently Asked Questions

Conclusion

EID is the identifier for the eSIM chip—the technology that is gradually replacing physical SIM cards. As more devices go eSIM-only, understanding EID becomes essential for managing cellular connectivity, activating new plans, and troubleshooting network issues. While EID is less commonly discussed than IMEI, it plays an equally important role in modern mobile telecommunications.

For more information on device identifiers, check our guides on IMEI, MEID, and ICCID. To check your device, visit IMEICheck.