Consider two public operation systems: iOS and Android.
1. Hardware connection: Use cables for different connectors.
iOS device connects lightning interface to USB mass storage.
App: iFile.
https://www.youtube.com/watch?v=VyeWy1Q_buU
iOS device connects to Android device. (Connector)
http://gadgetsin.com/lightning-cable-with-micro-usb-connector-for-sharing-photos-videos-and-power.htm
iOS 30 pins connector to micro-USB.
http://www.bidorbuy.co.za/item/176648234/Micro_USB_Male_to_Apple_30_Pin_Female_Charge_and_Sync_Cable_for_iPad_iPhone_and_iPod_Black.html
Micro USB Male to Male Adapter Cable For MHL Mobilephone Power supply Charger
http://www.bidorbuy.co.za/item/176648234/Micro_USB_Male_to_Apple_30_Pin_Female_Charge_and_Sync_Cable_for_iPad_iPhone_and_iPod_Black.html
Micro USB Male to Mini USB Male Adapter Cable
http://www.miniinthebox.com/micro-usb-male-to-mini-usb-male-adapter-cable-for-samsung-galaxy-s3-i9300-and-others_p504541.html
2. OS supports USB mass storage?
The OS needs to support USB-OTG.
The USB On-The-Go introduces the concept of a device performing both master and slave roles .
Android version 3.1 or newer supports USB On-The-Go, but not on all devices
(App USB OTG Checker (Android) could tell you.)
Android OTG compatibility list:
http://www.corsair.com/zh-tw/landing/otg-compatibility-list
http://www.kingston.com/us/usb/otg
For iOS, Apple limits the function not for all devices.
USB OTG Connect kit
Funtion 1: iPad mini/4th/air for Photos/Videos and connect with USB PC Keyboard, USB Piano Keyboard.
Funtion 2: in case of iPhone 5/5S, Only connect with USB PC Keyboard, USB Piano Keyboard. Not Photos/videos (refer to https://www.youtube.com/watch?v=Gig4sCA0vK8)
http://www.mobilefun.co.uk/blog/2014/06/the-complete-guide-to-usb-otg-adapters/
USB flash drive for all iOS.
http://www.amazon.in/i-Flashdrive-16GB-pendrive-iPhones-iPhone/dp/B00P4WAY5K#productDetails
http://buy.ezship.com.tw/street/fb_store_prod_main.jsp?store_id=ezship_bctd&pd_id=169798
3. Support App
Android - ES File Explorer
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