iMessage
I get a message An error occurred while activating iMessage, try again.
When activating the phone number
I tried a lot of solutions and it didn't help
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It might take up to 24 hours to activate iMessage and FaceTime. If the issue continues after 24 hours, follow these steps: Make sure that your device has the latest version of iOS or iPadOS. If you're using an iPhone, contact your carrier to make sure that you can send and receive SMS messages.
If you get an error when trying to activate iMessage or FaceTime - Apple Support