Can't unlock my SIM with its PIN (iPhone 4S in Germany)

I'm a T-Mobile Germany customer and I can't unlock my SIM card with the PIN number in my iPhone 4S. I can unlock the SIM card just fine in another phone, and it works without problem in my iPhone 4S as long as there's no SIM PIN on the card, but attempting to set a PIN on the card causes the phone to just sit there and wait and wait.
T-Mobile Germany stated that they are working with Apple regarding some kind of SIM PIN related problems (dropped calls, no SMS messages, etc..) on the iPhone 4S, but they state that it's not a T-Mobile problem (other carriers have it too), nor is it a problem with the SIM cards. That means there's a hardware/software fault on the iPhone 4S, and if that's true, then it must affect people outside of Germany.
Is anybody else experiencing SIM PIN related problems with the iPhone 4S? Anybody who doesn't live in Germany/didn't get their phone from Germany?

hello i am using 5.0.1 iphone 4s for about 2 months. Last night i spoke with my friend and the morning my signal looks like 5 bars but i noticed that i couldn’t make a call the phone freezes and i couldn’t unlock my sim card.
i tried t restart my phone 3 times but nothing i changed the sim 2 times and put my original sim back and works but today the same problem.
ok i unlocked my sim card after 3 restarts but with 5 bars carrier cant make cals Any solution ?

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Can't unlock my SIM with its PIN (iPhone 4S in Germany)

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