i want to know that after switching off my static ip option in phone ,, why my wifi is not accessing ?

IP assignments are specific to each network, so ask the network admin of the network you are using what is required since not all are the same.
That said, if I change such a thing I may have to reboot then forget and re-join the networks.

Assuming your system still sees the SSID of the WiFi accesspoint, then you will need to change your network (WiFi) configuration to use DHCP to get a network address from the local router.

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