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Apple this week provided troubleshooting steps for iPhone owners who are unable to activate iMessage with a phone number in iOS 26.
According to Apple, some customers might not be able to activate iMessage with a phone number if there is an inactive SIM or eSIM with the same phone number as an active SIM on the iPhone.
Customers who are experiencing this problem will see a “Not Delivered” alert for sent iMessages, and iMessages won’t be able to be received. Messages will be sent and received via
