Learn how to resolve network issues on Xiaomi Poco F4 and F4 GT, including call and text message reception problems. Follow these steps: check network status, toggle airplane mode, restart device, enable/disable SIM card, disable WiFi calling, force stop Message & Phone app, clear app cache data, update app, reset network settings, eject/re-insert SIM card, update phone, perform factory reset, check SIM for physical damage, and contact carrier.