iwatch is not ringing or vibrating when receiving calls?

Hi

The following steps may help:

If you have not yet done so, update your iPhone and Apple Watch to the latest software, starting with your iPhone:

• Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support
• Update the software on your Apple Watch - Apple Support

On your iPhone, in the Watch app, go to: My Watch (tab) > Sounds & Haptics:

• Check that the Alert Volume is towards the centre or right hand side;
• Check that Silent Mode is not enabled;
• Check that haptic strength is set to the middle or far right hand side of the slider.

On your watch: when viewing the time, swipe up on the watch face to open Control Centre > check that Do Not Disturb is not enabled (the button with the moon icon).

On your iPhone, in the Watch app, go to: My Watch > Phone:

• Perhaps choose Custom and check that all desired options are enabled, including Sound and Haptic under the Ringtone heading.

If you are not already doing do, you may wish to use your watch with these settings:

• On your iPhone, in the Watch app, go to: My Watch > General > Wrist Detection - turn this on.
• On your iPhone, in the Watch app, go to: My Watch > Passcode > Turn Passcode on.
• Still within the Passcode settings screen, also enable Unlock with iPhone.
• After putting it on your wrist, your watch will then unlock after whatever you do first: either unlocking your watch manually (by entering the passcode) or unlocking your iPhone. It will then remain unlocked until you remove it from your wrist, when it will lock again automatically.

With Wrist Detection enabled, make sure that you have placed the watch on your wrist and unlocked it before placing an incoming call to test whether it rings.

Check control center(swipe up from bottom on Watch face) make sure silent(bell) and/or don not disturb (moon) aren't enabled

Make sure it has good contact with your wrist. Hopefully it is an easy fix. If this doesn't help you will have to reset/re-pair etc.