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My mobile internet isn't working on my iPhone 4s it was however working yesterday.
I have checked the following:
* apn settings
* o2 availability (my gf is on o2)
* switched off and on again.
If anyone has any ideas I would be very grateful.
Try reinstalling your settings by using this easy guide:http://www.slideshare.net/kfaura/iphone-internet-settings-simulator
If reinstalling your settings does not work, i'm not sure why but every now and then my phone does this and i end up having to be a day without internet for some reason..
So, if all else fails, i'd expect it to be running again by tomorow