Hi there Exseda,
We understand you're seeing a triangle with an exclamation mark during FaceTime calls on your iPhone. We're glad you've connected with us here in Apple Support Communities, and we can provide some guidance.
"If your cellular connection or Wi-Fi network are running slow, or other users are streaming audio or video on the same Wi-Fi network, you might have these issues:
- Connection alerts or unable to connect
- Choppy video calls
- Black screen
- Dropped calls
Make sure that both you and the person that you're calling are using a fast Wi-Fi or cellular connection. If you’re using Wi-Fi, FaceTime requires a broadband connection."
Learn more from this support article:
If you can't make a FaceTime call on your iPhone, iPad, or iPod touch
We hope this provides some clarity about the behavior you're experiencing with FaceTime on your iPhone. Don't hesitate to let us know if you have any more questions.
Cheers.