With an inexpensive USB OTG adapter, you can connect things like keyboards, USB hard drives, and even gaming controllers to your Android phone or tablet.

OTG, or USB On-The-Go, was first introduced in 2001 and is supported by most major mobile platforms, including Android, iOS, and Windows Phone.

OTG allows for the reverse — the phone becomes the computer. All kinds of devices can be used: USB hard drives (even 1 TB or larger ones), wireless adapters, USB sound cards and also — my favorite — ...

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However, some external hard drives might not work with the OTG cable, especially the ones that draw power from the phone. The drives need to be in FAT32 or exFAT file format to work with OTG.