Why when I have my case on my iPhone it doesn't have Wi-Fi

So I got this to case and when I put it on it doesn't have good Wi-Fi at all but when I take it off it has Wi-Fi:/ why? The case is nothing special just a regular hard case. So why does it do this?

Added (1). Yeah it's an iPhone 4. But when I had a different hard case on it, it didn't do it:/

Probably because yours is an iPhone 4?

The case is blocking the signal on the side of the little black strep's.

Most 'hard' cases contain either plastic or a bit of metal…

In both cases if it's thick enough, it'll block the Wi-Fi signal from coming in, even worse, it'll start to effect your basic 3G service too… I'd suggest switching to a silicon case, such as these ones here:

http://www.ebay.com/...0904602841

The rubber will protect your phone and WON'T block your signal.

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