Wi-Fi not working on iPhone 4?

My iPhone 4 won't connect to Wi-Fi unless I'm in the same room as the Wi-Fi box. As soon as I leave the room that the box is in it disconnects. & won't reconnect until I go back to that room. My iPod and laptop & my sisters iphone 3 will connect anywhere in the house. I have called apple and they want me to pay 300$ for a warranty before they'll help me! 10 points to best answer

Firstly try a restore
if that doesn't work, check the metal around the edge of the phone, on teh plastic gaps, is anything letting them connect to each other eg you dropped it and the metal is dented and touched the other bit.

if you have a case on the phone, does it have any metal that connects the outside of the phone to the other parts of the phone.

if the above do not work then it is your wificard which is damaged, the best solution is to buy a new part off ebay and fix yourself or take to a local store and get them to repair it

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