Einleitung
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.