If your mobile device does not accept digital audio input, the GMM can be connected using the 3.5mm analog output. When connecting to a smartphone, you will need to set the Analog Output Select Switcb switch to either the Out 1 or Out 2 position. For most smartphones the Out 1 (CTIA / AHJ) position is the appropriate setting. If your mobile device uses OMTP wiring for the input, use the Out 2 position.
For more information on smartphone wiring visit Will a Go Mic Mobile work with an Android device?