Hey there Ahmad541,
Thanks for reaching out to the Apple Support Communities. We understand you're unable to activate your phone number for use with iMessage and FaceTime, and we'd be happy to provide you with the best steps.
To get started, check out the steps listed in the following resource that can help with the particular issue you're seeing: If you can’t turn on or sign in to iMessage or FaceTime - Apple Support
If the issue remains after going through the steps above, then the next best option would be to reach out to Apple Support directly from this link here: Get Support - Apple
From that link you'll want to choose iPhone > Apps & Features > SMS, MMS, or Messages not working as expected. From there you should see a few options to reach out, depending on your location.
We hope that's able to help.
Take care!