How to Make Calls on Apple Watch using Siri
Step 1. While wearing your Apple Watch, Raise your wrist and say “Hey Siri”
Note: You need to Enable Hey Siri on your Apple Watch in order to use this Hands Free feature. In case you have not enabled Hey Siri, you will need to raise your wrist and hold the Digital Crown to activate Siri.
Step 2. Next, say Call [Contact Name]. For example, you can say “Call Tom” in case you are trying to call Tom (your contact).
If there is more than one Contact with the same name, Siri will list both Contacts and ask you which Contact you want to call.
Step 3. Choose the Contact that you want to call by tapping on the Contact Name on your Apple Watch or by saying Siri Call [Contact name].