Why my iphone can't reach Wi-Fi?

I have a iphone 3gs and i have this problem: i can't reach a Wi-Fi connection that my laptop can.
on my laptop Wi-Fi is normal, but on my iphone is not visible and i tried to connect manualy but it said ''connection not found''.

Added (1). I tried to get closer to router but then i have to go outside because router is placed in other building where is mini office and i hate going outside at night

Perhaps your laptop can use a poorer connection. Try moving closer (if it seems sensible).

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