How come the Wi-Fi won't connect to my new iPhone?

I just got a used iPhone today, perfect shape nothing wrong with it. I got home and tried connecting it to the Wi-Fi, and it connected but only in the room with the router. I go out of the room and I lose connection. Is there any way I can fix this? On my Laptop and itouch I get perfect Wi-Fi all the way downstairs in my room. Anyone know what's wrong? Or have had the same problem?

My iPhone Does the same thing, they don't get very good connection unless you have a wide range router, it's perfectly normal but I would recommend getting a wide range router.

Buy a wireless range extender. That should help.
I think it costs around 50 dollars.

I bought this one last year and it works great
Netgear - Wi-Fi Booster for Mobile Range Extender

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