This closeup shows the bottom of the iPhone's applications circuit board. The open slot (1) houses the AT&T SIM card; the iPhone not only is locked to AT&T service, but it's also locked to the specific AT&T SIM card that comes with it. We tried inserting a non-iPhone AT&T SIM card--and the phone wouldn't recognize it. Hidden under (2) is 8MB of multipurpose flash memory--which is in addition to the iPhone's 4GB or 8GB of primary flash storage.
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