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Error activating imessage. What is the reason?

The reason for this is the following:

First, the activation method may be wrong.

Second, the imessage function may not be enabled. The solution is as follows:

1. First, enter *#5005*7672# in the dialing page, and then press the dial key.

2. If the word "0" appears, it means that the SMS has not been set.

3. Then the input *5005*7672* will be restored. Press the dial key again.

4. Then, a page that the SMS center has been successfully set appears, indicating that the number has been preliminarily set.

5. Restart the phone.

6. After directly entering iMessage, you can see that iMessage is active.