IPhone 3GS Sim is apparently 'locked' giving 'no service'....

I have a iPhone 3GS, and as it has the feature to lock sime it prevents any service if not putting the pin in. After putting the correct pin in the service works and is fine, however a few minutes later it goes back to no service and then you have to turn phone on and off again and restart the process. Even if I take the SIM lock feature away, this makes it worse as it just goes 'no service' as if the sim was still locked.
Is there a way to prevent all this drama?

I have a simalar problem. On the 3rd day I have the 3Gs the phone was "SIM LOCKED". Just before this happened I turned off WIFI because at home I am out of range of 3G. At work I am in range. The phones SIM locked up and gave me the option to put in a new sim #. I went to my ATT store and "HE" came close to accusing me of trying to change my sim #. I have no knowlege of how to do this or why to do it! He put in a new # to unlock the sim and handed me the phone to put in a passcode #. It worked fine untill the next morning. I plugged the charger in and the same problem>>Sim lock! I clicked on "UNLOCK" and it asked for a passcode, I put in the number I had put in at the store and it unlocked. Ok now I powered the phone off an turned it back on and again the Sim is locked now it says I have 3 attempts remaining to enter pin. Next I powered off again and powered on and this time it gave me 3 attempts again so I guess the only problem is to enter my code every day. Does anyone know is this a security feature or just a feature I can turn off if I chose?
cwvcr1

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Second: If I'm currently an iPhone 3G user, can I use the old SIM card to use the iPhone 3GS?
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For me "illegitimate" sounds very much like "illegal"
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