How do I fix FaceTime not working on my iPhone?

Re: iPhone 17 Pro Max, iOS 26 : "FaceTime is not working"

You might want to check that you have the latest version of iOS26 installed so you have the newest security updates, bug-fixes etc.

You can check in Settings > General > Software updates.

If an update is available: It is always wise to back-up iPhone before updating the iOS.

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Else if iPhone's software is already up-to-date:

If you have VPN installed: Unless it is one provided by an employer, try turning it off (or better yet uninstall it!) in case it is causing interference.

More info: If your device has network connectivity issues, check for VPN and other third-party security software - Apple Support

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Also: Restarting your device can often restore order if something is not working as expected: (deletes temporary files, re-establishes connections, and may update any recent setting or account changes etc. If needed See how to restart iPhone.

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If you still need help with FaceTime:

Apple support provides a trouble-shooting article that may help:

See what to do: If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support

or

If making and receiving calls is the issue you have:

See what to do: If you can't make or receive a FaceTime call on your iPhone or iPad - Apple Support