Network settings iPhone 4

[Anonymous]

Hey.
This question may have been asked before but I just got an iPhone 4 and everything is working fine except for the mobile network. It doesn't seem to be any connection with the 3G since I cannot check my mail or any other things that require internet access. 
I cannot change the settings myself (Settings-general-network-etc) because there's no network "tab" to tap yourself into. Is this just a 3G problem or is there any settings that I need to download?

[jonsie]

It's quite probable that the settings are wrong. Have you tried a full restore in itunes or setting up as a new phone to see if you can get the settings menu back?

[Liquid]

Try settings>general>mobile data>mobile data network check to see if APNs are correct.

Try switching 3G off and then on

[Anonymous]

I updated my bundle to include wireless internet (3G). I turned iphone4 off and on, this did not work. I reset the network settings general-reset, this worked and connected to internet with wifi turned off, however a word if warning, I lost all my wifi connection codes and I had about 20 peoples houses/ locations where I can connect. So now I have to ask them for their ridiculously long and complicated codes all over again. There may be other settings lost, that I am not aware of yet, surely there is a way to just get the original setup text from O2 again? Maybe a call to them and they can resend it? I would try this next time.

[MI5]

You can send a text containing the word "active" to 2020