Why doesn't my phone connect to wifi?

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Accomplice

Why doesn't my phone connect to wifi?

I know it's not my wifi because if it was I wouldn't be able to go on the internet on my laptop as of now. I think it's the phone. I tryed all my boost mobile phones and it would not work. Any reasons why? All I keeps saying is connected, not connected and my LTE just stays on? I don't wanna use all my data now.