Unsuccessful iMessage activation

First, check to know whether you have an SMS plan enabled at least for One SMS with your carrier. Contact your Carrier (Cellular Service Provider) the agency who issued the SIM to you

If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS. (One SMS Only)

See the pic below

4 Step Process --> Turn off and restart iMessage and FaceTime (The order/sequence is very important)

1. Go to Settings > Messages and turn off iMessage.
2. Go to Settings > FaceTime and turn off FaceTime.
3. Restart your device.
4. Turn iMessage and FaceTime back on (Watch the GIF hereunder)

Hello, zouhair192!

After reviewing your post, it seems like you are trying to get your number active with FaceTime and iMessage. We definitely understand that not being able to use those apps can be a concern and we'd love to help. Let’s start by reviewing this article: Add or remove your phone number in Messages or FaceTime.

Please let us know if you have follow-up questions, or if the issue remains unresolved. Have a great day!

Thanks for getting back with us, zouhair192.

We understand the issue remains unresolved and know that is a challenge. We want to make sure you reach the right team for help with your device. We recommend that you contact Apple Support directly, as there are a few additional steps you will need to take that have to be handled with a live agent. Depending on your region, you may be able to reach them here: Get Support.

Thank you for participating in the Apple Support Communities and good luck to you!