Wi-Fi problems with iphone 4?

It shows the Wi-Fi symbol but says searching or no service. When I go to my Wi-Fi networks it shows the arrow meaning it's connected. How do I fix this problem?

You can solve the problem by just doing the reset network setting so follow the steps below:

Goto setting -> General -> at the bottom see Reset -> Click Reset network settings.

Note: Performing the network reset shall delete the all saved passwords for all Wi-Fi connections.

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