Re: FaceTime & iMessage won't activate even after 1 year of SIM swap
See what to do: If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support
You may want to work through the trouble-shooting steps in Apple support's online article (link below):
See what to do: If you can't make or receive a FaceTime call on your iPhone or iPad - Apple Support
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If you still need help:
Wondering if you are using wi-fi for the internet ok, or if you depend upon cellular data.
and ...
whether you have have browsed through Apple Support's newest online article on how to:
Use FaceTime with your iPhone or iPad - Apple Support
Eg: says: "You can use FaceTime over Wi-Fi (1) You can use FaceTime on any of these devices on Wi-Fi: iPhone 4 or later, iPad Pro (all models), iPad 2 or later, iPad mini (all models) and iPod touch 4th generation or later (only iPod touch 5th generation or later support FaceTime audio calling).
or
over mobile data on supported iOS or iPadOS devices. (2) With a mobile data plan, you can also use FaceTime without Wi-Fi on any of these devices: iPhone 4s or later, iPad Pro (all models) and iPad (3rd generation or later).
Also says:
"Turn on FaceTime
Open the FaceTime app and sign in to your Apple Account. You can also do this from Settings > Apps > FaceTime.
If you’re using an iPhone, FaceTime will automatically register your phone number.
If you’re using an iPhone or iPad, you can register your email address:
- Go to Settings > Apps.
- Tap FaceTime, then tap Use your Apple Account for FaceTime.
- Sign in to your Apple Account."
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Re: Non US btw
FaceTime isn't available in all countries or regions.
Above article says: "FaceTime isn’t available or may not appear on devices purchased in United Arab Emirates. Group FaceTime and FaceTime Audio are not available in China mainland on iPhone and iPad (Wi-Fi + Cellular) models".
If needed you can : Get help with FaceTime on your iPhone, iPad, or iPod touch in Saudi Arabia - Apple Support