IPhone4 can't connect to known wifi

Within our home we have three devices (Mac book, iPad, and another iPhone4) that are connecting to our wifi. For the past few weeks, my iPhone4 would sometimes find the wifi connection. Now, it doesn't find the wifi connection at all, even if the phone is inches from the router. I've tried to power off and to retart the phone which does not change it. I've reset the wifi router, but I recognize that it's likely not a problem with the router since three other devices connect just fine. I've also noticed that it rarely picks up other wifi's.
Any suggestions?

just to double check that you tried everything click on the link
IOS troubleshooting Wifi http://support.apple.com/kb/TS1398

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on your phone - settings - general - reset - reset network settings.

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If you are using WEP as a security on your router that is why it won't connect. WEP is so old school and very insecure that Apple has made it so there WiFi cards won't connect to WEP. It might as well be wide open. You can try that. Take all security, WEP/WPA/WPA2, off your router and see if it connects.
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Hello NotAppleSavy,
Thanks for the question. After reviewing your post, it sounds like the computer wont connect to networks. I see you have used network diagnostic. I would recommend that you read this article, there are a lot of other things you can do in this article that may be able to help you resolve or isolate the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
Thanks for using Apple Support Communities.
Have a nice day,
Mario

Can't Connect to any WiFi network

I just got my iPhone yesterday and I'm already having a serious problem,I can't connect to any WiFi networks.
I can see the networks around me and I can select networks that I've setup and I know are open or I know the security passwords, I can even enter the network passwords for the ones that require them and it accepts them without complaint. When I select a network I get a little check mark next to that network which I assumes means it should be connected to that network. However, the iPhone never actually connects to them, i.e. no IP address, no router no nothing in the network settings screen for each network, and always appears to the using the Edge wireless network when accessing the internet.
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I updated the phones software to 1.1.4, has anybody reported problems like this with this or any version of the software.
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theevilone,
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In addition hardware or MAC address filtering can cause issues where you connect to the network and not get DHCP.
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Hello Sir!
After weeks of testing, i found the solution of my question. It´s quiet simply!!
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Hello!
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Turn Off your iPad. Then turn Off the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi. (This is probably not practical in your situation.)
On your iPad go to Settings > General > Reset > Reset network settings and see if that enables you to connect.
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
 Cheers, Tom

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IPhone4 can't connect to known wifi

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