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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.
I also did some testing with how ebooks work on the microSD card, including Kindle-formatted ebooks, PDF files, and ePub ebooks, and will explain how to make those work. First off, there are three Fire tablets that have microSD card slots. They are the new tablets for 2015, the 5th generation Fire tablets. That includes the entry-level $49 Fire, the Fire HD 8 and the Fire HD 10. Quick Tip: Remember to safely eject your memory card when removing it from your Fire tablet by going to Settings > Storage > Safely Remove SD Card.