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iOS 26 iMessage Issues: Fix SIM Activation Problems

10/3/2025

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Summary

Story summary

iOS 26 causes iMessage activation issues for users with multiple SIMs sharing the same phone number, resulting in Not Delivered messages.
Messages show green bubbles, signaling SMS or Rich Communication Services (RCS) instead of iMessage.
Apple recommends removing inactive SIM cards via Settings > Cellular to fix.
After removal, reselect the phone number in Messages settings to reactivate iMessage.

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Story summary

iOS 26 causes iMessage activation issues for users with multiple SIMs sharing the same phone number, resulting in Not Delivered messages.
Messages show green bubbles, signaling SMS or Rich Communication Services (RCS) instead of iMessage.
Apple recommends removing inactive SIM cards via Settings > Cellular to fix.
After removal, reselect the phone number in Messages settings to reactivate iMessage.