IPhone 4 cannot detect wifi unless almost next to router

I've had my iPhone 4 for about 2 months now and it could detect wifi at quite a good range. But until recently I have had to get almost completely next to the router for it to detect. It's not my wifi; my sister's phone can detect it at a certain range, but mine cannot. I don't know what happend to it! HELP!
(PS My sister also has an iPhone 4)

Hello lvorwerck,
The troubleshooting steps detailed below can help resolve issues with signal strength when using Wi-Fi on your iPhone.
Wi-Fi disconnects or signal strength is less than expected
Move closer to the Wi-Fi router (access point).
Check for sources of potential interference.
Remove any case, stand, or other accessories from your iOS device and see if signal strength improves.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings. Note: This will reset all network settings including
previously connected Wi-Fi networks and passwords
recently used Bluetooth accessories
VPN and APN settings
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
Cheers,
Allen

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IPhone 4 cannot detect wifi unless almost next to router

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