IOS 5.1 / iPhone 4s - 3G toggle doesn't stick / turns itself back on after reboot.

I wonder if anyone else has experienced this bug on the 4s with iOS 5.1 ?
I have:
Cellula Data > OFF
Enable 3G > OFF
After a device reboot I notice the battery is draining fast and I check in cellular data settings and sure enough 3G has turned itself back on.
I have reported this using Apple Feedback but wanted to see if anyone else has uncovered this bug / can reproduce it. I can reproduce it after each and every reboot.

I can confirm this behaviour is initiated by the network operator and not the phone. If your phone goes off and then comes on it negotiates with the network and the network then chooses to put your phone into 3G mode.
For now it's just a matter of remembering each time you have rebooted or reset your device to immediately go and switch 3G off. It would be nice though if Apple could make the user choice stick but it seems this part is actually out of their control due to the way the networks behave.
Some days when I leave the house I enable cellular data and of course turn 3G off, then I spend the whole day driving around and it stays on Edge the whole day. Other days it doesn't stay on Edge and I notice halfway through the day that 3G has turned itself on again so this is definitely being turned back on by the network operator.
Just another note: If your 3G is turned off but you see your battery is draining fast for no reason, turn 3G On, wait a few seconds and then turn it Off again. I don't know why but somehow even though it shows off it sometimes seems to not actually be properly off.

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