Best answer: SD stands for "Secure Digital", SDHC stands for "Secure Digital High Capacity", SHXC stands for "Secure Digital eXtended Capacity". From the names only you can tell the main difference in all three i.e. storage capacity. SDHC cards offers between 4GB to 32GB and SDXC offers more than 32GB.
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Best answer: Most cell phones use Micro SD cards. The item you asked about is the regular SD card, most likely used in Cameras, and other larger recording devices. The cell phone you are interested in should list what type of card it uses in its SPECS section. Most likely a micro-SD card (smaller cards).