IPhone 4S not detecting wi-fi anymore?

Hadn't had problems until about mid-october. IPhone always detected my home and dorm wi-fi but now it never does. I never really did anything different except update iOs, wi-fi says it's on, airplane mode off, and everything the same. Even tried adding the wi-fi's manually but it detects absolutely nothing.

Might be a hardware problem.take it to the apple store, they'll replace if for free

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