Can I just use a smartwatch without a cell phone?

pu1. I don't know if a smartwatch is meaningful because I don't have a cell phone, but I think I can only use a watch

2017-12-20

OK

pu2. http://www.ittoday.co.kr/news/articleView.html?idx...
Does that mean something like this? A phone-free smartwatch is a wearable device that has a USIM chip and a phone number assigned separately in the smartwatch, so it is not connected to a mobile phone and can talk independently.

2017-12-20

OK