After updating to iOS 26, some iPhone users may notice that their iMessages fail to send, showing the frustrating “Not Delivered” error. This issue is often linked to eSIM setup, iMessage activation, or account settings. In this guide, we focus on official solutions and effective methods reported by other users to fix this problem.
Official Apple Solutions
Apple has published official guidance for resolving iMessage issues, especially after setting up a new eSIM:
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Go to Settings > Messages.
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Turn iMessage off, wait a few seconds, and then turn it back on.
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In Send & Receive, make sure your phone number is selected instead of an email address.
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If a spinning icon appears next to your number, it indicates iMessage is verifying. Please wait patiently.
Other Effective Methods Reported by Users
If the official steps do not resolve the issue, the following user-tested methods can help:
1. Remove invalid SIM cards or eSIMs
Having multiple SIMs, including inactive or invalid ones, can cause conflicts. Remove any unnecessary or inactive cards.
2. Sign out and back into your Apple ID
Go to Settings > Apple ID, sign out, restart your iPhone, then sign back in.
3. Check date and time settings
Ensure Set Automatically is enabled under Settings > General > Date & Time to avoid activation failures.
4. Use Apple’s online activation tool
Visit apple.co/IMFT-mac and follow the instructions to complete iMessage activation.
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Conclusion
iMessage “Not Delivered” issues after iOS 26 are typically caused by activation problems or eSIM conflicts. Following Apple’s official guidance, combined with user-tested solutions such as removing invalid SIMs, re-logging into Apple ID, verifying date/time, and using Apple’s online activation tool, can resolve most problems quickly.
