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If you need to add or remove a phone number from Messages or FaceTime, you can do so in just a few steps.

To add a phone number:

1. Open the Settings app on your iPhone.

2. Tap Messages.

3. Tap Send & Receive.

4. Tap Add Another Phone Number.

5. Enter the phone number you want to add, then tap Done.

To remove a phone number:

1. Open the Settings app on your iPhone.

2. Tap Messages.

3. Tap Send & Receive.

4. Tap the phone number you want to remove.

5. Tap Delete.

you can also check source: Add or remove your phone number in Messages or FaceTime - Apple Support.