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Report Abuse. The Kindle Fire HDX does not offers SIM card slot and the model you mentioned is WiFi only, which would provide you internet only when connected to a WiFi hotspot, you cant use internet outside WiFi hotspot as there is not network provider.
Amazon sells MicroSD cards that are made specifically for their Fire tablets. They are good quality cards, but you can often find very similar cards on Amazon for a little less. These are the requirements when it comes to memory cards on Fire tablets: Support for FAT32 and exFAT formatted microSD cards.