My iphone 4s won't detect any wifi networks.

Hi
My iPhone 4s won't detect any wireless networks. It was working fine until last night when the connection dropped int he middle of me watching a programme. At first I thought it was our router, but I reset that about 5 times, and all other devices are working fine on it. The phone won't detect any other networks either - if I ask to join a network it comes up with the message "could not scan for wireless networks". I have tried resetting the network settings as suggested on the support page, but it hasn't worked. Can anybody help? Thank you.

If no change after resetting network settings on the iPhone, try restoring the iPhone with iTunes as a new iPhone or not from the backup.
If no change after that, the iPhone has a hardware problem.

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Out-of-Warranty Service
If you own an iPhone that is ineligible for warranty service but is eligible for Out-of-Warranty (OOW) Service, Apple will service your iPhone for the Out-of-Warranty Service Fee listed below.
Please note Out-of-Warranty Repair Service fees from your carrier may be different than those listed below.
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Dear All
my iphone is suddenly stopped receiving WIFI networks, whenever i am tring to conect to any WiFi network My iphone could not find that networks at all, i tried to find wifi network manually by typing network name but steel my iphone could not detect that network! Even if I'm 2 millimeter from the router it's not recognize any network. i reset network setings but it doesn't work, i upgred my iphone softwere to 3.0.1 but steel no wifi
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Hi there Minakshilodha,
You may find the troubleshooting steps in the article below helpful.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
-Griff W.

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Software Versions:
CoreWLAN:          3.4 (340.18)
CoreWLANKit:          2.0.2 (202.11)
Menu Extra:          8.1 (810.11)
configd plug-in:          8.5 (850.252)
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en1:
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Firmware Version:          Broadcom BCM43xx 1.0 (5.106.98.100.17)
MAC Address:          xxx
Locale:          FCC
Country Code:          X0
Supported PHY Modes:          802.11 a/b/g/n
Supported Channels:          1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
Wake On Wireless:          Supported
AirDrop:          Supported
Status:          Off
<Edited by Host>

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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Check to be sure the wifi is sending data, use another device to check it...

My iphone 4s won't detect any wifi networks.

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