Dual USB drives designed to work with Apple iPhones and iPads utilize Apple’s proprietary Lightning port. Typically, these drives have a Lightning connector.
USB OTG (Android)
The other main interface for smartphones and tablets is USB OTG (On-the-Go). Most non-Apple devices use this interface, including most Android smartphones.
While USB-C is still relatively new, some devices that use USB-C ports are starting to come into the market, such as Apple’s Macbook.