IPhone 5 can't detect Wi-Fi, but iPhone 4 can?

My iPhone 5 can't detect Wi-Fi even though the box is next door, I live in a flat.
I have to sit in a particular position to actually get it. It happened on holiday as well, the router was like 10 meters away from me outside, while I was inside and it simply could not find the Wi-Fi while my iPhone 4 could.
I already removed the network settings, but no change at all. Tips?

Do you mean like it detects it automatically and connects it.

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