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Welcome to MacRumors, licorub1. :)

The SIM card can be accessed by pressing a small pin or paperclip into hole inside the SIM card tray, located either on the side of your phone (iPhone 4) or the top (previous models). Here is a good Apple Support article with pictures. http://support.apple.com/kb/HT1438

Let us know if you need more information.
 
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