iOS 26 - How to FaceTime Not Working on iPhone!

After updating to iOS 26, FaceTime stopped working and kept showing 'Activation Unsuccessful' Error on any iPhone, including iPhone 16, 15, 14, 13, 12, and 11 Pro Max, so looking for a way to fix the issue? Need help to fix FaceTime problems on any iPhone with the iOS 26 update to start audio and video calls with other Apple users effortlessly? Don't Panic, This troubleshooting guide to fix FaceTime not working problems on an iPhone running on iOS 26 or later. #iOS26FaceTime #FaceTimeNotWorkingiOS26 0:00 Intro: FaceTime Not Working on iPhone after iOS 26? 0:10 Solution 1: Enable or Restart FaceTime 0:32 Solution 2: Sign Out and Sign In Apple ID 0:54 Solution 3: Restart SIM Connection