Wi-Fi connection problems on iPhone 3GS?

So I'm just after getting an iPhone 3GS off a friend. When I connected the phone to my house Wi-Fi there was a strong connection all around the house and outside. Today I dropped my phone and since then I can only get a Wi-Fi signal when I'm in the same room as the Wi-Fi box, as soon as I leave the room I lose the Wi-Fi signal. Any help on how to fix this would be much appreciated!

Well thats to bad

Great get new one

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