Flip the Ring/Silent switch back and forth. It should vibrate on one option or the other depending on the settings. Open the Settings app. Tap the Sounds & Haptics option. In this screen, ensure that the Vibrate toggles for your desired options are enabled. If these options were already enabled, or this doesn't help, check to be sure you have a
This article explains how to adjust the sounds of your notifications or turn them off completely: How to put your iPhone on vibrate, ring, or silent mode - Apple Support. Change ringtones, sounds, and vibrations1. On iPhone 7 and later, go to Settings > Sounds & Haptics. On earlier iPhone models, go to Settings > Sounds.2.In the FaceTime app, click on the “Audio” tab. In the search bar, start typing the name or number of the person you want to call. Once you see the contact or number you want to call, click on it. The FaceTime app will initiate the call on your Mac, and your iPhone will start ringing, even if it’s on silent.2. Check your Notification Settings. One reason why your Apple Watch may not be ringing or vibrating with incoming calls is that your iPhone’s notification settings may be off on your Apple Watch. To turn those on, go to the Apple Watch app on your iPhone. Make sure you are on the My Watch tab and select Notifications.