I am facing wifi and mobile 2G signal issue after upgrading to IOS 6 from IOS 5 in IPhone 3GS. Please help, restoring setting even didn't helped.

I am facing wifi and mobile 2G signal issue after upgrading to IOS 6 from IOS 5 in IPhone 3GS. The mobile carrier signal as well as WIFI suddenly drops zero and are then restored automatically. Sometimes i cannot conenct to WIFI even standing infront of WIFI router. Please help, restoring setting even didn't helped.

Update: my phone's connecting to the WiFi again. I don't know what did the trick. I did nothing since reinstalling the software. It hadn't worked then, it is now. I tried connecting to my dad's phone's hotspot( he uses a Moto G), and it worked. I then tried connecting to the WiFi at a friend's house, and when I came back home, my phone was able to connect to my WiFi! Is it of any significance that my friend's router doesn't require a password? My issue has been resolved( for now; I hope I'm not counting my chickens before they've hatched). For anyone facing a similar issue, I suggest you try everything I did:
1. Turn your router off for a minimum of 30 seconds, turn it back on and try connecting.
2. Click on the WiFi network you are connected to, scroll to the bottom, tap "Renew Lease".
3. Do a soft and hard reset.
4. Reset network settings.
5. Back your data up, erase all content from settings menu, restore from backup.
6. Reinstall your software( put it in recovery mode).
I am not sure which of the above worked for me. Make sure you try everything. If none of the above works, take it to a genius bar or an authorised service provider. Good luck! :)

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If you know the password to your apple id login - you can then do a restoration once you have put your device into recovery mode using itunes.
read this article to give you direction how to put your device into recovery mode.
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http://support.apple.com/kb/ht1808

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This thread is talking about sort of similar issue (although it is about the VGA adapter):
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Hi,
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I have taken it out of the case - I figured it would obstruct the sensor (also have no screen protector).
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You mentioned to go in the MAC store > Would they replace it (for free) if they reach the conclusion it's some sort of manufacturer faulty wiring even if it's a 3Gs (as an old model)?
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I am facing wifi and mobile 2G signal issue after upgrading to IOS 6 from IOS 5 in IPhone 3GS. Please help, restoring setting even didn't helped.

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