No, popular international calling apps like WhatsApp and FaceTime are generally blocked in mainland China and require a reliable VPN to function.
Due to China's 'Great Firewall,' many foreign-based communication services, including WhatsApp, FaceTime, Instagram, Facebook, and Google services, are inaccessible. This means that even with a local SIM or an eSIM providing data connectivity, these apps will not work without an additional solution.
To use these apps for video or voice calls, you will need to install and activate a robust Virtual Private Network (VPN) *before* you arrive in China. Ensure your chosen VPN is known to work reliably in China, as many VPN services are also blocked. Your eSIM will provide the necessary data connection, automatically connecting to the strongest available major network like China Mobile, China Unicom, or China Telecom, though the exact network may vary by your specific plan.