Facetime not available on my iphone 7

You might have issues using FaceTime for one of these reasons:

• FaceTime and FaceTime audio calling might not be available for all countries, regions, or carriers. 
• FaceTime isn't available or might not appear on devices purchased in Saudi Arabia, Pakistan, and United Arab Emirates, including Dubai. However, with iOS 11.3 or later, FaceTime is available on iPhone, iPad, and iPod touch in Saudi Arabia.
• Call forwarding isn't available with FaceTime.
• If you try to switch from a FaceTime call to a phone call or a FaceTime audio call.

If you can't make a FaceTime call on your iPhone, iPad, or iPod touch ...

https://support.apple.com/en-us/HT204168