Iphone 4s wifi suddenly stopped connecting to home network

My iphone 4s suddenly stopped connecting to my home wifi 2 weeks ago, now it won't even bring it up on the list of available networks. I have tried resetting network settings, have tried manually connecting but it says "unable to locate network". Why would this all of a sudden start doing this when I have had this phone for over a year. My husbands iphone 4 has no problems whatsoever and connects to our home network just fine so I know it is not the router. This is so frustrating

I'm currently suffering from this problem as well. If you or your husband can get your iPhone open, there may be a screw in the upper antenna area of the iPhone that is loose (this screw grounds the antenna to the chip/mainboard).
http://www.iphoneshopusa.com/blog/wp-content/uploads/2012/04/top-shield-iphone4- wifi-problem1.png
It's pointed out in the image above. Many have tightened the screw and said their Wi-Fi optimally again. Having a phone for a year does mean a lot of wear-and-tear: dropping, vibration, heat, all accumulate so that the delicate components inside get knocked around and, in this case, loose. Try this method! (If you can, of course.)
Good luck!

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Hello, ictoau.
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http://support.apple.com/kb/ts3780
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Some people who experience issues connecting to or even seeing there Wireless network should follow these steps.
These steps are just a guideline and its not 100% that it will fix your issue.
Mainly, if the issue persists, its possible there is an issue with your iOS settings or a hardware failure within your iPhone or iPad, specifically the Wifi adapter.
You would want to follow these articles to do a reset & restore prior to saying it is a hardware issue.
#1: Reset: http://support.apple.com/kb/HT1430
#2: Restore: http://support.apple.com/kb/HT1414
You will need to access your Admin control panel for your router.
If you have an Airport Extreme BaseStation, you just need to open the Airport Admin Utility found in Applications > Utilities Folder.
Enter your credentials and you will have access to the settings from there.
For a PC: Do NOT use the CD that came with your router. That is used for people who do not know how to setup a router properly and these settings will not be available for you in most cases.
If you are using anything other than an Airport BaseStation:
Open a web browser:
In the address bar, type:
192.168.1.1 (Mainly used for Asus, Linksys, etc) or 192.168.0.1 (D-link,Belkin)
How to figure out what the IP address is to type in?
Windows:
Hold down the windows key, then press R. This brings up the run box. In that box type "cmd" (without the quotes) and press enter. In the black box that pops up, type "ipconfig" (without quotes) then hit enter. Your default gateway is the IP address for your router. It will start with 192.168.....
Take that number and put it into the address bar in your browser and hit enter. It will then ask you for a user name and password. For linksys, it's admin for both. If you have another brand, just google "default password for ******" replacing the asterisks with the brand name of the router. Once you have entered the correct user name and password, you're there.
Mac:
1.From the Apple menu, select System Preferences.
2.In System Preferences, from the View menu, select Network.
3.Select the appropriate port. For example, choose Ethernet for broadbandconnections, AirPort for wireless, or Internal Modem for dial-up.
4.Click Advanced... , and in the sheet that opens, click the TCP/IP tab.
The number next to "Router:" is your default gateway.
Once you get into your admin panel do these setting changes.
1.On the router change the channel for the 2.4mhz band to channel 1, 6, or 11 (recommended), rather than auto.
2.Also set that channel width to 20hz only, rather than 20hz or 40hz (Auto)
3.Make sure Security is set to WPA/WPA2-Personal. Anything else will cause issues. (of course, make sure you know your password for security)
4.Make sure to Apply/Save these settings. Sometimes the wireless connectivity will go out during this change and will come back on within 15-30 seconds.
5.On the iPhone/iPad go to Settings > Wi fi > click the blue arrow beside the network > Select Forget network
6.Go to Settings > general > reset > reset network settings
7.Power the phone off and on. Connect again
For additional assistance in troubleshooting Wifi connection problems go here: http://support.apple.com/kb/TS1398

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Hey all,
So I've had my iPhone for probably about 4 months, and up until about 2 or 3 weeks ago, WiFi was working fine on it. Then, one day, I left home and came back a few hours later, and I couldn't connect to the home network. I can still see the network, and it comes up with the signal strength and everything seems normal, but then I go to connect and a message pops up saying "Unable to join network [Home]".
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Hi garth_w,
If you are having issues connecting to your home network from your iPhone after a change in routers, you may find the following article helpful:
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https://support.apple.com/kb/TS1398
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Use G band, not N. I encountered a lot of problems with my new router on wireless N. Here is a reply I wrote for the other posts about iPad connectivity problems:
I have the base iPad 16gb Wi-Fi model and it was connecting to wifi fine. A few days ago I had to get a new modem/router. I bought a netgear dual band model (G and N) and used wireless "N" on my my two MacBooks and my iPad.
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Hello,
I have upgraded to Mountain Lion. Wifi is working well except at home.
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Iphone 4s wifi suddenly stopped connecting to home network

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