Low cell signal After upgrade to IOS 5.1.1 to my iphone 4

After upgrading my iphone 4 to IOS 5.1.1 ,my cell signal becomes very low and after some time it shows no service.

Do you know if your "Cell Network Search" under "Location Services" is on or off. I have been struggling with the same issue, on and off and this is one of the settings I have changed recently.

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    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).
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  • HT201269 cannot use iphone 4 as personnal hotsport after upgraded to ios 6

    After upgraded to ios 6, I cannot use my iphone 4 as personnal hotsport for my ipad.

    Verify that your carrier supports Personal Hotspot for your device and that you have Personal Hotspot enabled on your cellular plan:
    From Here  >  http://support.apple.com/kb/HT3574
    Personal Hot spot
    iOS System Requirements  >  http://support.apple.com/kb/HT3574
    Understanding  >  http://support.apple.com/kb/HT4517
    Trouble Shooting  >  http://support.apple.com/kb/TS2756

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    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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