Network lost problem with iPhone 4g

I have iPhone 4G. I have had nothing but problem with the network m using ( Vodafone ). I have been suffering 'Network Lost' on a very frequent basis on my iPhone(I am with 5.0.1 OS). I don't have any idea what is causing this and how to fix it ? so have had the device replaced second times. I am on my third phone. The first two replacements were made by Apple retail store. Not wanting to repeat the trip for forth time .I'm very much disappoint with apple .

Hello jebintom,
Thank you for the details of the issue you are experiencing with the App Store on your iPhone 4s when using the Wi-Fi network at work. I found a couple of resources that I think might help with this.
First, I recommend reviewing the section titled “Isolate the issue: (Mac OS X, Windows, iOS)” in the following article and specifically step 4 of that section:
4. iTunes uses well known ports and these ports may need to be opened for iTunes: 80, 443, 3689, 5297, 5298, 5353, 8000-8999, and 42000-42999.
iTunes: Advanced iTunes Store troubleshooting
http://support.apple.com/kb/TS3297
I also recommend reviewing the following article for the recommend settings for Wi-Fi routers and access point:
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
Thank you for using Apple Support Communities.
Best,
Sheila M.

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