That phone in your pocket is essentially a miniature computer, and can do more than just make phone calls, view social media (nairaland, lindaikeji etc) and post to your Facebook account. Most (if not all) Android devices use a USB connection for changing and transferring files, and thus conveniently work with flash drives, too. So if you've got pictures and files to transfer or video files to watch on a long journey ride you don't have to limit yourself to a laptop or desktop computer, or wait for them to transfer over to your device.

This howto will walk you through on how to set this all up, but there is one caveat: You'll need to have a rooted device. There are plenty of how-tos and walkthroughs that can help you figure out how to root a phone or tablet, and it's a fairly simple process, for the most part. The best place to start is at the XDA Developers Forums.

Gather your materials
You'll need a physical USB OTG (On-the-Go) cable with a male microUSB connector-to-female full size USB port. You can easily find one at GSM village.

You'll also need to download two apps: one that actually mounts the flash drive, and a file explorer; (ES File Explorer and StickMount.)

Plug it in
Connect the OTG cable to your phone, then attach the USB Flash Drive. Launch StickMount and then tap OK to mount the drive. You can also choose to have StickMount launch automatically every time a flash drive is connected.

The app will pop up an alert to let you know if the mounting was successful, and list the directory where you'll find your files in the file explorer app.

Start exploring
Fire up the file explorer app—ES File Explorer, in this case. Head to sdcard/usbStorage and look for the name of your flash drive. Tap it, and you should be able to see the files contained on the memory stick.

And this will work on any Droid without rooting, I use a galaxy grand duos which isn't compatible.

It only works on otg support fones

https://www.nairaland.com/2109924/cheap-8gb-usb-2.0-otgetter still buy an OTG Flash drive

Does it work on any android device or only on those that support otg?