Iphone Wi-Fi only connects in a certain place?

My Iphone4 only connects to Wi-Fi when I'm sat in a certain place, e.g. When I'm in my living room it will connect perfectly, but when I go upstairs to my bedroon or whatever my Wi-Fi messes up and goes onto 3G and doesn't find my Wi-Fi name, so I have to use my internet data up?
Why does my phone do this? How can I solve it if I can?

It must be your router modem (Internet cable) move it into a position where it's not underneath anything(apart from the roof, duh?) that all the cables are connected.
most of all you should contact your provider, your Internet must be really slow and is not compatible in some areas. Internet shouldn't be so weak.

You might need a stronger router. I had to buy a new one because the old was not working well with my smart TV, 2 laptops, roku and 2 phones. So where is your router located, is it downstairs.

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