Yes, yaySIM does not provide eSIM plans for China that include a phone number or SMS service. Their offerings for China are data‑only, meaning users can connect to the internet but cannot send or receive phone calls or text messages using a local Chinese number.
Travelers who need voice or messaging may rely on VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection. However, some destinations may limit or block access to certain VoIP services, so it is advisable to confirm that the apps you plan to use are available in China before purchasing a plan.