My Wi-Fi doesn't reach my iPhone 4?

My home Wi-Fi reaches throughout my home for my laptop, iPod touch and PS3, but after traveling 20 or so feet away from the box my iPhone 4 disconnects. Even in the room next to the one with the box, my connection is only at 2/3 bars. Is this because of the latest software update, or something else entirely?

Your iPhone have a Wi-Fi antenna that is connected to the Wi-Fi module by just touching the contact pad inside. If you ever had your phone screen replaced chances are they haven't cleaned the contact pads before re-assembly and thus is a poor quality.

I doubt it's an update because my iPhone works same as before- fine even 75 yards away from Wi-Fi router.

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