Using a China Mobile SIM card alongside a VPN requires specific network configurations because local carrier traffic often triggers stricter DPI (Deep Packet Inspection) protocols than foreign roaming eSIMs. The most stable approach is to prioritize a professional-grade protocol like OpenWeb or StealthVPN within your client, while disabling features like automatic 'WiFi Assistant' or 'Smart Network Switching' on your phone, which can leak your real IP address when transitioning between cellular and local networks.
