eSIM Not Working on iPhone Duo? A Complete 2026 Fix Guide

Several things can stop an eSIM from working. First, check whether the eSIM actually appears on your iPhone. Then check the carrier, device lock status, and Dual SIM settings.

Check Whether the eSIM Plan Was Added at All

Open: Settings > Cellular

Or Settings > Mobile Data

Look under the SIMs or Cellular Plans section. You should see the lines installed on your iPhone.

Use this quick guide:

If the second plan does not appear at all, the iPhone may not have installed the eSIM profile. Apple supports several ways to set up an eSIM on iPhone, including carrier activation, eSIM Quick Transfer, QR codes, carrier links, carrier apps, and manual entry, depending on the provider.

Is the iPhone Duo Unlocked and Does the Carrier Support the Plan?

Do not confuse iPhone eSIM capability with carrier approval. Your iPhone may support two eSIMs, but your carrier still needs to support eSIM service. Apple says that when you use two different carriers, the iPhone must be unlocked. If both plans come from the same carrier, the carrier-lock requirement works differently.

To check the lock:

1. Open Settings.

2. Tap General.

3. Tap About.

4. Find Carrier Lock.

5. Look for No SIM Restrictions.

If you see No SIM Restrictions, the phone is unlocked for other carriers. You should also confirm that your carrier supports eSIM for your country and your specific plan. Apple maintains a current list of carriers and the activation methods they support.

Most iPhone Duo eSIM activation problems come from a disabled line, incomplete carrier activation, a failed QR code, network issues, or incorrect Dual SIM settings. Start with basic checks before deleting the eSIM or resetting your iPhone. The steps below cover the most common activation problems and what to do next.

At a Glance: eSIM Troubleshooting Checklist

Before trying specific fixes, work through these quick checks:

iPhone Duo eSIM Stuck on Activating

If your iPhone Duo eSIM stays on Activating, first connect to Wi-Fi and make sure the affected line is turned on. If it continues after basic troubleshooting, the carrier may need to complete the activation or provision the eSIM again.

Follow this decision path:

Avoid deleting the eSIM repeatedly while troubleshooting. Once an eSIM profile is removed, you may need your carrier to issue a new QR code or complete another activation process.

iPhone Duo eSIM QR Code Not Scanning

If your iPhone Duo eSIM QR code is not scanning, the code may be difficult for the camera to read, expired, already used, or not supported for your current activation process. Try these checks before requesting a replacement.

iPhone Duo eSIM Is Greyed Out

A greyed-out eSIM can indicate that the line is not fully active, the eSIM installation did not complete correctly, or the carrier has not finished the transfer or activation.

Go to Settings > Cellular or Settings > Mobile Data, then select the affected eSIM. Check whether the line can be turned on or whether its settings are unavailable.

If the eSIM remains greyed out:

If the carrier confirms that the plan is active but the eSIM remains unavailable, the issue may be related to the iPhone's software or eSIM installation.

Why One eSIM Works but the Other Shows No Service

When one line works normally but the second eSIM shows No Service, the iPhone itself can still connect to a cellular network, so the issue may be specific to the second line, its carrier, coverage, or activation.

Go to Settings > Cellular or Settings > Mobile Data and select the second line. Check that:

An iPhone can use two active numbers, but cellular data uses one line at a time. If switching the selected data line does not resolve the issue and the second eSIM continues to show No Service, review Apple's steps for when Dual SIM with eSIM isn't working, then contact the carrier to check the plan, network coverage, and eSIM activation status.

If you have checked the carrier, QR code, SIM settings, and network connection but the problem continues, an iOS software issue may be involved. At this point, you may consider Tenorshare ReiBoot as an optional third-party iOS system repair tool, particularly after your carrier has confirmed that the eSIM plan is active.

Tenorshare ReiBoot is designed to address certain iPhone software issues that can affect normal operation, including freezes, boot loops, black screens, update failures, and recovery mode problems. For an eSIM issue, it may be relevant when the carrier confirms that the plan is active but the iPhone continues to show unusual system behavior. Its Standard Repair mode is intended to resolve supported iOS issues without removing personal data.

Key Features

• Standard Repair: Repairs supported iOS system problems while aiming to keep your personal data and settings intact. It can be an option when system-level glitches affect normal iPhone features, including cases where the Control Center is not working.

• iOS System Repair: Helps address software problems that may continue after restarting or updating the iPhone, including issues associated with iOS 27 bugs. For eSIM troubleshooting, this may be relevant only after the carrier has confirmed that the eSIM plan and activation are valid.

• Wide Device Support: Supports many iPhone models and iOS versions, depending on the version of ReiBoot you use. Check the current product compatibility information before starting a repair.

• Recovery Mode Support: Helps put a compatible iPhone into recovery mode when normal methods do not work properly. This can be useful if the device is unresponsive or affected by an iPhone 18 boot loop.

• Firmware Installation: Downloads the required iOS firmware package and uses it during the selected repair process. Keep the iPhone connected to a stable internet connection and avoid interrupting the installation.

How to Use ReiBoot for a Persistent iOS-Level eSIM Problem

1. Why is my eSIM suddenly not working on my iPhone Duo?

Your eSIM may stop working because of a carrier outage, account issue, network problem, disabled line, failed activation, or iOS problem. First check Settings > Cellular, restart the iPhone, toggle Airplane Mode, and check your carrier connection. If the line still shows no service, contact your carrier.

2. Why can't I activate eSIM on my iPhone Duo?

The carrier may not support eSIM for your plan, the iPhone may have a carrier lock, or the activation information may not work correctly. Check whether your phone shows No SIM Restrictions under Settings > General > About > Carrier Lock. Also confirm that your carrier supports the eSIM activation method you are using.

3. How to check if an iPhone is carrier locked for eSIM?

Open: Settings > General > About > Carrier Lock If the phone shows No SIM Restrictions, it is unlocked. If the phone shows a carrier restriction, contact that carrier to ask about unlocking requirements.

4. How to transfer an eSIM from a previous iPhone model to iPhone Duo?

If your carrier supports eSIM Quick Transfer, you can transfer a number from your previous iPhone during setup or through the Cellular settings. Apple also supports carrier activation and other transfer methods depending on the provider. With newer iOS versions, some supported carriers and devices also support eSIM transfer between Android and iPhone. If your carrier does not support direct transfer, you may need a carrier activation process or a new QR code.

When eSIM Not Working on iPhone Duo becomes an issue, start with the simple checks before moving to advanced repairs. Confirm that the eSIM plan appears in Settings > Cellular, verify that your carrier supports eSIM and your specific plan, check whether your iPhone must be unlocked, and use the activation method provided by your carrier, such as a QR code, carrier app, or manual activation details.

If your carrier confirms that the eSIM and account are active but the iPhone still shows activation errors, no service, or other abnormal behavior, an iOS system repair tool such as Tenorshare ReiBoot may be an optional next step.