HT201210 I have error code -43 when trying to upgrade iPhone 3GS running v4.3 to version 5 or above. This error occurs whilst trying to back up phone during upgrade process. 2GB of free memory on phone. Can anyone help?

I have error code -43 when trying to upgrade iPhone 3GS running v4.3 to version 5 or above. This error occurs whilst trying to back up phone during upgrade process. 2GB of free memory on phone. Can anyone help?

Well I spoke too soon.
The update was successful, but now I cannot connect to the 3GS data network.
Cannot get email and cannot open a page in Safari.
+"Safari could not open the page because the server stopped responding."+
+"Cannot Get Mail+
+THe mail server is not responding. Verify that you have entered the correct account info in Mail settings."+
Email and internet work fine on WiFi.........no data using 3GS network.
Looks like I will have to revert back to old OS.

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