Why won't my Wi-Fi work correctly?

My Wi-Fi router is in my office at bottom of my garden My iphone 3gs use to pickup the router no problem, now i have be sat near the router for my phone to pick it up? Any idea why the iphone won't pickup the signal anymore from the home? I'm updated corectly?
10 hours ago

I've not moved router and my wifes iphone works fine, its just suddenly not picking up the router unless its near it.

Added (1). Some answers i'm sure are for points, i've tried another iphone its fine, prob is my phone

You should try another device to detect the Wi-Fi signal… That way you can check if it's the router's problem or the phone's. If the router is faulty get a new one

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