The cellular version of applewatch cannot be used in Beijing.

If the cellular version of Apple Watch is the National Bank version, it can be used all over the country, mainly depending on whether the SIM card traffic is universal in the whole country, but not the National Bank version.

The cellular version of Apple Watch means that you can make phone calls and send text messages without your mobile phone. The cellular version of Apple Watch means that you can make phone calls and send text messages without using a mobile phone, but it is limited to ordinary text messages, not counting imessage.