Samsung Galaxy S21 Ultra
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It's not possible to use Wi-Fi
Solution 4 of 4: Your phone is connected to a Wi-Fi network, but you're not logged on
Some Wi-Fi networks require you to log on via a web page.
Open the internet browser on your phone and try to load a web page. The internet browser is redirected to the homepage of the Wi-Fi network. Follow the instructions on the screen to log on to the Wi-Fi network.