IPhone 4 gets barely any Wi-Fi

My iPhone 4 has been getting very little Wi-Fi reception, lately, and I have no clue why. Everything else on my network gets full bars throughout the house (thanks to a range-extender) however, my iPhone will *literally* get 30-40 feet of reception, before dropping off and going to 3G. :/ please help!

Always remember that all Wi-Fi routers show good signal, when the device is within 5 metres radius. After that it is the duty of repeaters to boost the signal. Sometimes, some devices do not get quality filled signals from repeaters, but work fine with Wi-Fi.

Also, if there's EM interference or if they are more electronic gadgets in the surroundings, then this problem can arise.

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