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Each device has a unique back with one having a plastic carbon fiber one, the other having soft touch, and the 9810 having silver textured plastic.
The back cover of the Bold 9930 is a plastic piece with a carbon fiber look. The battery and microSD are found under the cover with a SIM card slot for world GSM use.
The SIM card slot is centered at the top of the battery compartment. You need to remove the battery before taking out the card.