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OTG cables are available from many stores such as Amazon for a few bucks or less.
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All this is possible thanks to a cheap OTG cable. You may find it difficult to believe that you can connect a USB device such as a flash drive into the micro USB port on your device. USB OTG lets you turn your Android mobile into a USB host and connect standard USB accessories including flash drives, hard drives, gaming controllers, keyboards and more. A little-known fact is that many of the Android devices on the market today are compatible with a technology called USB on the Go or USB OTG for short.
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