What is this and how I can remove

Just change the setting in your phone. Settings > Hotspot & tethering > Wi-Fi hotspot > Advanced > AP Band > 2.4GHz


@tyagikeshav30 if you are connecting to home wifi connection then keep pressing ok, it will accept. If you are connecting to mobile hotspot then do as told by @swapnil.ravi10



Its a warning message that instructs users to choose 2.4GHz network and not 5GHz.

You can ignore this as most of the Wifi sources are 2.4GHz

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