My iphone 6 wont connect to wifi?

So, for around a month my phone hasn't connected to any wifi but I have unlimited so iv'e been using that. But my wifi works on my laptop, playstation, etc. Iv'e tried resetting my network connections, my phone, etc and I don't know what to do. Is it a problem with my phone or the wifi itself?
Update: It used to auto connect now it doesn't
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