Introduction
This is a GSM phone originally introduced by AT&T. The SIM card will likely be an AT&T card; however, when in foreign countries, other SIM cards can be inserted into the phone for compatibility with foreign carriers.
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            Next remove the battery 
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            Lift it out of the phone using the tab on the battery (marked in the image) 
 
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            The SIM card holder is now exposed (marked in image). 
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            This will likely already have an existing SIM card in it if the phone has been previously used. 
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            To open this, slide the holder upward (assuming the same orientation as in the image) 
 
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            Now hinge the SIM card holder down so that it lays flat in the phone. 
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            Slide the plastic holder downwards to lock it in place. 
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            Now the battery and cover can be put back in place. 
 
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To reassemble your device, follow these instructions in reverse order.