Sim Pin Bug?

Hi,
I'm not sure but I may have found a bug in the new iOS using iPhone 5. I've done a search for the scenario which I'll explain. But I can't seem to see anyone replicating this.
I have a pin set for both the unlocking of the phone and for the sim also. On reboot of the phone it asks for these and a call can't be made until the sim is unlocked. Standard behaviour. On the iPhone 4 I used to have, the phone would ask for these directly after each other. However with the iPhone 5 the sim pin is asked after the phone has been unlocked for a few seconds.
I've found if you reset the phone (hold the home button and the power button until the apple appears and the phone reboots) put in the unlock code and then quickly before the phone asks for the sim pin touch an app or go into settings, the phone doesn't ask for the sim pin and you can make calls. The setting still shows that sim pin is active and this doesn't work if you reboot with the power button then slide to off and repower on the phone.
I was just wondering if anyone is able to replicate this. Or if this is the normal behaviour. It seems pointless to have a sim pin if you can bypass it like this.
Michael Watkin

Boot in safe mode,see if the same occurs:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien

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Sim Pin Bug?

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