Why is my iPhone 4 suddenly not connecting to the Wi-Fi?

Just the other day i went to sleep and i woke up and my phone wasn't connected anymore, (it has been connected to the Wi-Fi for over 1 year now with no issues) I messed with it a little bit and now i have the Wi-Fi connection bars so it looks like its connected (kinda)… Most apps i use will say "Unable to connect to ___" Like for example i use kik a lot and it just keeps saying "connecting" when i go on it. I signed out of it and now it says "unable to login" and other stuff like "unable to connect to the app store" and etc. BUT it lets me use google chrome on it perfectly. So its as if its connected but its being really picky. How do i fix it? Thanks in advance

Added (1). I have already done: Reset my router twice, Reset network settings, restarted my phone

Go outside

Well I'm not quite sure but my ant had a iPhone 4 -4s I'm not sure but back to the point the point is that it would do all these weird stuff but she got a new one. The thing is Apple is tacking over and old phones they release new one and they totally f*** up the old ones

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