Did you ever think the day would come when we could call someone right from our wrists? It still seems like the stuff that science fiction is made of, but you can, in fact, make and receive phone calls on Apple Watch. On Apple Watch, calls are routed through the iPhone, but you can answer even with your iPhone in another room or tucked away in a pocket, carrying on an entire conversation right from your watch.
Answering a Call
You can also choose to answer the call on your iPhone or send a text message. When the call comes in, turn the Digital Crown or swipe upwards to access these options.
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Article Link: How to Answer and Make Phone Calls on Apple Watch