Schiit claims Modi will work with an iPhone not sure about Android. See discussion at link here. Start at discussion post #154
http://www.head-fi.org/t/640785/schiit-modi-usb-dac/150.
From the Audioquest site...
Can I use DragonFly with Android devices?
Yes. DragonFly Black and Red will work with most Android devices running on Lollipop OS (and some Android devices running on KitKat), provided that the device manufacturer has adhered to the USB specification and implementation, and supports audio over USB.
To verify that your Android device complies with isochronous USB audio, download and run USB Host Check.
Android devices use a USB format known as “OTG” (On the Go). In order to connect an Android device in USB Host Mode to a DAC, an OTG adaptor must be used. (See www.audioquest.com/dragontailOTG.)
Visit the AQ site for additional info.
http://www.head-fi.org/t/640785/schiit-modi-usb-dac/150.
From the Audioquest site...
Can I use DragonFly with Android devices?
Yes. DragonFly Black and Red will work with most Android devices running on Lollipop OS (and some Android devices running on KitKat), provided that the device manufacturer has adhered to the USB specification and implementation, and supports audio over USB.
To verify that your Android device complies with isochronous USB audio, download and run USB Host Check.
Android devices use a USB format known as “OTG” (On the Go). In order to connect an Android device in USB Host Mode to a DAC, an OTG adaptor must be used. (See www.audioquest.com/dragontailOTG.)
Visit the AQ site for additional info.