Samsung
Switch to Mobile Data Automatically auf Samsung
Samsung phones default to Wi-Fi whenever a network is in range, even if the signal is too weak to load pages or stream reliably. The Switch to mobile data option in the Wi-Fi advanced settings fixes this by letting the phone fall back to cellular data automatically once Wi-Fi quality drops below a usable level.
To enable it, go to Settings ➔ Connections ➔ Wi-Fi ➔ open the Menu ➔ Advanced ➔ turn on Switch to mobile data.
Once active, the phone checks the actual quality of the Wi-Fi connection in the background. If it detects a bad signal, it disables Wi-Fi and routes traffic through mobile data instead, then reconnects to Wi-Fi automatically once the signal improves.
This setting only helps when your mobile data plan has enough headroom, since the switch can pull cellular data for browsing, streaming, or downloads. If cellular reception in that location is also weak, turning the toggle off and managing Wi-Fi manually may work better than relying on the automatic switch.
This option only governs internet routing. It is separate from Wi-Fi calling, so voice calls are not affected unless your carrier ties the two together.