(1) Is my phone compatible with SS07 ?
SS07 requires an Android smartphone with USB host support. As a guidance please check: http://www.sandisk.com/goto/dualdrive/, if your phone is in the list there is a good chance it will be compatible. If in doubt, please ask for a confirmation about the compatibility of your particular model of smartphone.
(2) What is the difference between MIC2 and MIC3 ?
MIC2 is the general purpose mic designed for SS07. MIC3 allows you to capture signals with higher SPL but features a little lower sensitivity. You might need MIC3 for very loud sound recordings, for example if the mic is placed close to high power loudspeakers.