IPhone 4 not connecting to Wi-Fi?

My iPhone 4 has been acting up lately and it is getting rather annoying. On my settings page, it shows that I'm connected to Wi-Fi with the blue checkmark, but on the service bar on top, it shows that I'm on 3G. My phone isn't allowing me to get on any app that requires internet, and kicks me out.

**I have rebooted my phone multiple times and I still have yet to have access to the internet.

This works on android but not for sure on iphone but its worth a try 1. Turn off data and make sure the Wi-Fi on mode is turned off. 3. Turn on airplane mode and then turn Wi-Fi on. If all goes right the Wi-Fi should stay on and if does turn off airplane mode. Hope this helps!

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