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What is a sim password?

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Ok, so I have two phones. They are both samsungs.. I have a t mobile simcard and if I put this simcard into one of my samsungs it goes straight onto the phones wallpaper and its ready to use and everything But if I try putting this simcard into the other samsung it asks for a sim password, and I've tried all the logical ones but they dont work. Why is it asking for a sim password on one phone but not the other? And I've also tried this simcard in other phones and its just my samsung that it asks for it in. And I've tried removing any passwords it may have when im using it in another phone but theres none to remove.. Should I take it into a shop or what?!?!