how I know my iphone model was real 3GS?

I bought my iphone last a month but *now days I realized that my model was MC131B verson 3.1.3(7E18)* setting on the phone . *my question is , what really does my iphone model is?*
When I bought this iphone the salesman told that was Iphone 3GS.
I'm confuse that when i saw my friends iphone that so many difference tools.
*please I need somebody to tell me what was my iphone model is?*

3GS, iPhone OS 3.1.3

Posted on Feb 13, 2011 10:04 PM

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how I know my iphone model was real 3GS?

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