Why won't my iphone 5 connect to my Wi-Fi?

I can sign anything into the Wi-Fi except my phone. It says "unable to join" I've turned the Wi-Fi on/off multiple times and turned my phone on/off also. I have reset the router and have reset network settings. I've turned airplane mode on/off even and nothing works!

I noticed it not on when I got home from school one day and it made me type it the wpa key. I did that and I worked for a while but then quit again. I'm afraid I'm going to use too much Internet data without it, considering Verizon isn't unlimited anymore.

I really need this solved.

Some phones are defective like that.happened to my dad he had to go to the store and have it fixed.

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