Wifi not working because case is kryptonite...

I recently bought 3 iPhone 4s for my family, but one iPhone 4s could not locate the Wi-Fi in our home while the other 2 had no issues with it, I contacted sprint, and went to there corporate store, after complete resets and numerous deactivations and reactivations the problem still was present. Sprint instructed me that the phone was the problem. I returned the phone and received a brand new in the box iPhone, this phone did the same exact thing, after calling sprint and doing everything possible they could not figure out the problem, but I did!!! The problem was a case I bought off eBay, for whatever reason this plastic case blocked the Wi-Fi signal, as soon as I remove the case it worked fine, when I put the case on the other iPhones I lost the signal, so I guess certain cases are like kryptonite for the iPhone. The name of the case I bought says minges on the box and it comes in all colors and has an elegant leather type backing the phone case is plastic so I don't know why it blocked the signal. Any ideas?

No there is no access control enabled in the router.Today my iphone connected with the wifi at a hotspot, and when i checked the connection i saw the ip address and all.At my home, my ip address, subnet and DNS fields are all empty.May be this can trigger you for solutions.

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