My iPhone 4 doesn't reconnect once it says 'No Sevice' and should I update my phone to iOS 6.1.2?

This has happened before, my iphone will not connect to any network once I go out places with wifi, so I went to the Apple Store and they gave me a new one.
Now I have had this one since June and it started not reconnecting to any network and I have to switch on and off the airplane mode in order to get the network back. Do people in Apple Store know how to fix this or is there actually any way to fix it?
I am using 3 so I don't know if they could be the problem.
Also, will updating it to iOS 6.1.2 help with this problem? However, I have seen a lot of posts saying their battery die really quickly after updating it , so I don't know if I should update it. My phone is not insuranced anymore so I don't want to risk.

If it really is an iPhone 3Gs and not an iPhone 3G...
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
If an Update Appears Install it... if not... you are up to date for your particular Device...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch

Similar Messages

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    I went to do the latest update on my iphone 4s, and it said to connect to itunes so I did and continued to click restore and then it updated my phone through itunes. Then after about 40 minutes of it updating it still has the connect to itunes screen on. It won't go away and I have tried restarting and turning off my phone various ways various times. I don't know what to do!

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  • I had my iphone 4 locked to vodafone uk carrier. I connected the phone to itunes on my pc and tried to update the version to ios 6 through itunes. But it has been locked and asks for sim of previous carrier. how can i return to previous state?

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  • HT4528 On connecting my iphone5 to my windows7 pc I am not able to open the iphone folder from my computers. It says "you dont have permission to access this phone"

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    I'm not sure what you're asking.  Are you writing a program that results in the error when you test it?  (This is the developer forum).

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    My Kindle app suddenly stopped working on my iPhone 4s. All my software is up to date and I have restarted the phone, uninstalled and reinstalled the app and it still opens and shuts down instantly. Any ideas?

    We need clarification here.
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  • HT4972 How to update I phone 4( iOS 4) to the latest version .not only that but updating my old software to a new in a iPhone 4 will it make any problem to the device or loose it's data completely .

    How to update I phone 4( iOS 4) to the latest version .not only that but updating my old software to a new in a iPhone 4 will it make any problem to the device or loose it's data completely .

    chrissaji1998 wrote:
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