TL;DR — Quick Answer
Every dual-SIM phone has two IMEI numbers — IMEI1 and IMEI2 — one for each SIM slot. When carriers provision your eSIM, they sometimes register it against the wrong IMEI. That creates an eSIM IMEI2 mismatch that can silently break data, cause activation failures, or block carrier features after an unlock. The good news? You can usually fix it yourself.
What’s the Difference Between IMEI1 and IMEI2?
Here’s the deal. Every phone that supports two SIM connections — whether that’s a physical nano-SIM plus an eSIM, or two eSIMs — gets assigned two separate IMEI numbers at the factory. These aren’t random. They’re burned into the hardware and can’t be changed.
IMEI1 is generally tied to the primary SIM slot. On older iPhones (XS through 13), that’s the nano-SIM tray. On newer eSIM-only models like the iPhone 14 and above (US versions) and the iPhone 17 series in several countries, IMEI1 maps to whichever eSIM profile you activate first.
IMEI2 is reserved for the second connection. On phones with a physical SIM tray, the eSIM almost always lives here. On Android, things vary — Samsung, Pixel, and other manufacturers each handle the slot mapping slightly differently.
The important thing to understand is that carriers don’t just see “your phone.” They see a specific IMEI. And they register your plan against that IMEI. When there’s a disconnect between which IMEI the carrier has on file and which IMEI slot your eSIM actually occupies, that’s where the trouble begins.
Dial *#06# from your phone’s dialer — it works on both iPhone and Android. You’ll see IMEI1, IMEI2, and your EID (Embedded Identity Document) listed on screen. On iPhone, you can also find them under Settings → General → About — scroll down past the eSIM section to see both IMEIs clearly labeled.
Why Does the eSIM IMEI2 Mismatch Happen?
It sounds like something that shouldn’t be possible in 2026, but the eSIM IMEI2 mismatch is surprisingly common. There are a few specific scenarios that trigger it.
The most frequent cause? Unlocking your phone and switching carriers. When you unlock a device — say you were on AT&T and you’re moving to T-Mobile — the new carrier provisions your eSIM against whichever IMEI you provide them. If you hand over IMEI1 but your phone assigns the eSIM to the IMEI2 slot (because there’s already a physical SIM or another eSIM occupying IMEI1), the carrier’s records and your phone’s reality don’t match.
Another common trigger is removing a physical SIM after setting up an eSIM. Let’s say you had a nano-SIM on IMEI1 and added an eSIM on IMEI2. You later pull out the physical SIM card. Some phones — particularly iPhones — will then reassign the eSIM from IMEI2 up to IMEI1. Your carrier still has it registered under IMEI2. Mismatch.
And then there’s the dual-eSIM shuffle. On phones that support two active eSIM profiles (like iPhone 13 and later), enabling and disabling profiles can cause them to jump between IMEI slots. The phone is trying to be helpful. The carrier’s system, unfortunately, doesn’t keep up.
When a carrier asks for your IMEI to set up an eSIM, many people just give them the first number they see. But if your phone has a physical SIM occupying IMEI1, the eSIM needs to be provisioned against IMEI2. Always confirm which slot is actually available before you hand over the number. Dial *#06# and note both.
IMEI1 vs IMEI2: Side-by-Side Comparison
This is where things click for most people. Here’s a clear breakdown of how IMEI1 and IMEI2 differ across platforms and what each one connects to.
IMEI1 vs IMEI2 — What Maps Where
| Feature | IMEI1 (Primary) | IMEI2 (Secondary) |
|---|---|---|
| Default Slot Assignment | Physical nano-SIM or first activated eSIM | Second eSIM profile or secondary SIM connection |
| iPhone (with SIM tray) | Nano-SIM tray — always IMEI1 | eSIM — always IMEI2 |
| iPhone (eSIM-only, US) | First eSIM profile activated | Second eSIM profile activated |
| Android (Samsung, Pixel) | Physical SIM slot 1 (or dedicated eSIM on some models) | eSIM slot — often locked to IMEI2, not swappable |
| Carrier Registration | Carrier records plan against this IMEI when provided | Carrier records plan against this IMEI when provided |
| Can You Swap Assignments? | iPhone Yes, via disable/enable trick | Android Usually not — hardware-locked |
| Mismatch Risk | Low if only one SIM is active | High after unlock, carrier switch, or SIM removal |
| What Breaks on Mismatch | Activation failures, no mobile data, “SIM not supported” errors, Wi-Fi calling disabled, VoLTE not working | |
Symptoms: How to Tell If You Have an IMEI Mismatch
An eSIM IMEI2 mismatch doesn’t always announce itself with an obvious error message. Sometimes it’s subtle — things just don’t work the way they should. Here are the telltale signs to watch for:
You scan the QR code, enter the activation details, and the setup just… doesn’t complete. The carrier’s system is looking for the eSIM on one IMEI, but your phone is presenting a different one. This is the #1 sign of a mismatch.
You see full bars and can maybe even make calls, but mobile data flat-out refuses to work. This happens when the provisioning is partially successful — voice connects on one IMEI, but the data plan is tied to the other.
You just got your phone unlocked, popped in a new carrier’s eSIM, and you see “SIM Not Supported.” If the phone really is unlocked (check under Settings → General → About → Carrier Lock), the problem is almost certainly IMEI-related.
These features are tied to specific IMEI registrations on the carrier’s end. If the IMEI on file doesn’t match the IMEI your eSIM is actually using, the carrier silently blocks these features. You won’t see an error — they just stay grayed out.
How to Fix the eSIM IMEI Mismatch (iPhone)
iPhones actually give you a workaround here. You can force an eSIM to move from one IMEI slot to another. It’s not officially documented by Apple, but it’s a well-known trick that works on iPhone XS through iPhone 17 series. Here’s the process:
Go to Settings → General → About. Scroll down to see which eSIM profile is listed under IMEI and which is under IMEI2. Note which IMEI your carrier has on file for your line (check your account page or call them).
Navigate to Settings → Cellular (or Mobile Data in some regions). You’ll see all your installed eSIM profiles listed. Identify the one that’s on the wrong IMEI slot.
Tap the eSIM profile and toggle it off. If you have two eSIMs and both are active, turn off the one currently sitting on the IMEI slot you want to move your target eSIM into. Your phone will ask which line to turn off — this is the key moment.
Turn the eSIM profile back on. When iOS prompts you with a popup asking which other line to disable (if applicable), select the line that was occupying the IMEI slot you want. This forces iOS to reassign IMEI slots. Your target eSIM should now be on the correct IMEI.
Go back to Settings → General → About and confirm the eSIM is now listed under the correct IMEI. Restart your iPhone. If your carrier still shows the old IMEI, call them and ask them to update the IMEI on your line to match.
If you’re on an eSIM-only iPhone with just one profile, remove the physical SIM (if present), turn off the eSIM, restart your phone, then re-enable the eSIM. Without a competing line, iOS will assign it to IMEI1 by default. If you need it on IMEI2 instead, add a temporary second eSIM profile first (even a free trial travel eSIM works), then use the swap trick above.
How to Fix the eSIM IMEI Mismatch (Android)
Android is more complicated here, and honestly, less flexible. On many Android phones — particularly Samsung Galaxy devices and Google Pixels — the eSIM is hardware-mapped to a specific IMEI, and you can’t swap it between slots the way you can on iPhone.
If your phone shows a separate “IMEI (eSIM)” entry when you dial *#06#, that eSIM is locked to that specific IMEI number. There’s no toggle or trick to move it.
So what can you do?
This is the fix in most Android cases. Call your carrier and have them re-provision your eSIM using the IMEI that’s actually associated with the eSIM slot. Dial *#06#, find the IMEI labeled as “eSIM” or “IMEI2,” and give them that specific number.
Go to Settings → Connections → SIM Manager (Samsung) or Settings → Network & Internet → Mobile Network (Pixel). Remove the existing eSIM profile entirely. Then request a fresh QR code or activation from your carrier — this time with the correct IMEI on file.
If the eSIM still won’t activate properly, go to Settings → General Management → Reset → Reset Network Settings. This clears saved Wi-Fi passwords, Bluetooth pairings, and APN configurations — but it can resolve stubborn provisioning glitches. You’ll need to re-enter Wi-Fi passwords afterward.
Unlike iPhone, most Android devices don’t allow you to reassign which IMEI slot an eSIM uses. Attempting to modify IMEI assignments through third-party tools or unauthorized methods can corrupt your baseband firmware, void your warranty, and potentially brick your device. The safe fix is always to work with your carrier to match their records to your phone’s actual configuration.
iPhone vs Android: Quick Fix Comparison
iPhone Fix Path
✓ Self-fixable in most cases
Android Fix Path
*#06# to identify eSIM IMEI⚠ Carrier involvement usually required
eSIM IMEI Mismatch: Symptoms, Causes & Fixes at a Glance
| Symptom | Likely Cause | Fix | Platform |
|---|---|---|---|
| eSIM won’t activate | Carrier has wrong IMEI on file | Re-provision with correct IMEI (dial *#06#) | Both |
| Signal but no data | eSIM on IMEI2, data provisioned on IMEI1 | iPhone: Swap IMEI slots. Android: Contact carrier | Both |
| eSIM works, then stops after removing physical SIM | Phone reassigned eSIM to IMEI1 automatically | Update carrier records to new IMEI, or swap back | iPhone |
| Wi-Fi Calling / VoLTE grayed out | IMEI on carrier’s system doesn’t match active slot | Confirm IMEI with carrier, update if needed | Both |
| “SIM Not Supported” after unlock | New eSIM registered on wrong IMEI post-unlock | Verify unlock status, re-provision eSIM on correct IMEI | Both |
| eSIM keeps dropping to no service | IMEI conflict between two active eSIM profiles | Disable one profile, let the other claim correct slot | iPhone |
Preventing IMEI Mismatches Before They Happen
Most of these problems are avoidable if you know what to watch for. A few habits will save you from headaches down the road.
Always dial *#06# before contacting your carrier and write down both IMEI numbers along with which slot each belongs to. When the carrier asks for your IMEI, give them the one that matches the slot where the eSIM will actually live.
Don’t remove your physical SIM carelessly. If you have a physical SIM on IMEI1 and an eSIM on IMEI2, pulling out the physical SIM may cause the eSIM to hop to IMEI1. If you’re planning to go eSIM-only, contact your carrier first and let them know the IMEI might change.
After unlocking, do a clean eSIM activation. Don’t assume your old eSIM profile will work perfectly with a new carrier. Delete the old profile, get a new QR code from your new carrier, and activate fresh. This ensures the carrier’s IMEI records are built from scratch with the right number.
Keep your phone updated. Both iOS and Android have rolled out improvements to how eSIM slot assignments work. Running the latest software minimizes the chances of provisioning bugs causing unexpected IMEI swaps.
The eSIM IMEI2 mismatch is one of those problems that seems mysterious until you understand what’s happening under the hood. Your phone has two IMEI numbers. Your carrier registers your plan against one of them. If those don’t line up with which slot your eSIM actually occupies, things break. That’s all there is to it.
Here’s your game plan:
No. IMEI numbers are permanently assigned at the factory and burned into your phone’s hardware. Changing or tampering with IMEI numbers is illegal in most countries and can permanently damage your device. The fix is never to change the IMEI itself — it’s to ensure your carrier registers your plan against the correct IMEI that matches your eSIM’s actual slot assignment.
Absolutely. You need to provide the IMEI that corresponds to the slot where your eSIM will actually be installed. If your phone has a physical SIM in slot 1 (IMEI1), your eSIM will go to slot 2 (IMEI2) — so give the carrier your IMEI2. If you’re on an eSIM-only phone with no other profiles, the eSIM will typically use IMEI1. Getting this right at activation prevents the mismatch entirely.
No. Your phone number is tied to your carrier account, not to the eSIM profile on your phone. Deleting the eSIM profile from your device removes the local configuration, but your number stays active on your carrier’s system. When you get a new QR code and reinstall, your number comes right back. Just make sure you have the new QR code ready before deleting the old profile so you’re not left without service.
When you remove the physical SIM from IMEI1’s slot, your iPhone may automatically reassign the eSIM from IMEI2 to IMEI1, since it’s now the only active line. But your carrier still has the eSIM registered under IMEI2. This creates a mismatch that can cause service disruptions. The fix is to either contact your carrier to update the IMEI on your line, or use the IMEI swap trick to move the eSIM back to IMEI2.
In most cases, no. Android phones from Samsung, Google, and other manufacturers typically assign the eSIM to a dedicated IMEI that’s hardware-mapped and can’t be changed by the user. If you dial *#06# and see a separate “IMEI (eSIM)” entry, that eSIM is locked to that specific IMEI. Your only option is to ensure your carrier provisions the eSIM against the correct IMEI from the start.
First, verify the unlock actually went through — on iPhone, check Settings → General → About → Carrier Lock. It should say “No SIM restrictions.” If it does, the “not supported” error is likely an IMEI mismatch or a provisioning issue. Delete the eSIM profile, contact your new carrier with the correct IMEI (the one tied to the eSIM slot), get a fresh QR code, and reinstall. If that still fails, ask the carrier to check if the IMEI is properly whitelisted on their network.
An unlock applies to the entire device, not to individual IMEI numbers. When your phone is unlocked, both IMEI slots become available for use with any compatible carrier. You don’t need separate unlocks for IMEI1 and IMEI2. That said, some carriers may only have one IMEI on file for your line — make sure they have the one that matches the slot your eSIM is actually using.
No, they’re different things. The EID (Embedded Identity Document) is a unique identifier for your phone’s eSIM chip itself — think of it as the serial number for the eSIM hardware. The IMEI2 is the identifier for the second SIM slot, which the eSIM may or may not use. Some carriers ask for the EID during eSIM setup (especially for eSIM Quick Transfer), while others only need the IMEI. When in doubt, have both ready — you can find them by dialing *#06# or under Settings → General → About on iPhone.
The information in this guide is provided for educational purposes and is accurate as of February 2026. Carrier policies, device behavior, and eSIM implementations vary by region, phone model, and software version. Always verify specific steps with your carrier and device manufacturer. Modifying IMEI numbers is illegal in most jurisdictions — this guide only covers legitimate methods to reassign eSIM slot positions and update carrier records. We are not responsible for any service disruptions that may occur from following these steps.
