IPhone 4S - iOS 6 - can't see WiFi networks

I have a strange problem with my iPhone. It's a locked iPhone, bought from Vodafone from my country. I use it locked and un-jailbreaked. I went in France for 2 weeks where i had my Roaming active, but i didn't used cellular data, only WiFi. Now, back home in my country, it seems that i can't see wireless networks. I tried to reinstall, update to the last firmware, it seems that wireless appear for 1 second when at first start, then it disappears and i can't see no more WiFi networks in list, tho there are like 10 networks around me.
Any ideas? Or someone else had the same issue?
Thanks,
Nick

i went to Vodafone. They said they will replace it. It seems like a manufacturing defect.

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GShumway wrote:
I cannot see the network from my macbook
It might help to reset the connection settings on your Mac using these steps one at a time until the problem is resolved, recognizing that, depending on your problem, not all of these steps will make sense:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (3), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
6) In the folder /Library/Preferences ( not <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
They may not help, but they'll only take a couple of minutes to try. Before you try these, if you have any special network settings on your Mac for things like DSL credentials, note all your network settings, because the latter steps will destroy them. If you got all the way to the last step, if things don't work any worse than before, you can trash the saved SystemConfiguration folder.

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IPhone 4S - iOS 6 - can't see WiFi networks

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