Xiaomi
Change Preferred Network Type auf Xiaomi
When your Xiaomi phone loses 4G/LTE signal in certain areas, it does not always fall back to another network technology on its own. The Preferred network type setting on your SIM card decides which standard the modem tries first, and if it is locked to LTE, the phone can keep searching for a signal instead of switching to a stable 3G or 2G connection.
Switching this setting manually helps in weak coverage spots because it forces the modem to accept older, more widely available network types instead of holding out for LTE.
Open Settings ➔ SIM cards & mobile networks. On a dual-SIM phone, pick the SIM card that has reception issues. Tap Preferred network type and choose between Prefer LTE, Prefer 3G or 2G only.
Choosing Prefer 3G keeps calls and light data usage stable where LTE coverage is unreliable. 2G only is a last resort for remote areas with very weak reception, but it slows down or blocks most data-heavy apps.
Test each option with the Live-Simulator before relying on it, since the result depends on which network types your carrier still operates in that location.