Can Apple watch insert an esim card and a physical card to make calls at the same time?

As long as the two card numbers are different, they can be used at the same time.

After the opening of the esim card, you can make or receive calls and send and receive short messages on binding devices such as smart watches. Call to display the main card number, which can be used separately from the mobile phone. Turn on the flow button on your watch and use the app on your mobile phone online, such as listening to music with your watch and replying to WeChat messages. This is similar to the traffic with a mobile phone card. The voice package and traffic of esim card are deducted from the main card.

The so-called eSIM card refers to a kind of virtual SIM card, which is built into mobile phones and other communication equipment before they leave the factory. The user's identity is authenticated by writing OTA into the terminal, so as to realize the functions of calling and surfing the Internet. When it comes to its greatest convenience, "one terminal with multiple terminals" can be realized. That is to say, in addition to their own main number, users can also add an accessory smart device using the eSIM card, which can enjoy the same mobile phone number and the same package fee.