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Why your smartphone keeps switching from Wi-Fi to mobile data

A smartphone that repeatedly switches from Wi-Fi to mobile data is usually signalling a problem with the Wi-Fi connection. Phones monitor signal strength, speed, latency and packet delivery to keep calls, streaming and messaging connected, and may automatically move to a more stable network. Common causes include weak Wi-Fi signals, interference and differences between 2.4 GHz, 5 GHz and 6 GHz bands, as well as network congestion or router malfunctions. Operating system settings can also enable automatic switching.