Yes, most phones are provided with a Micro-B regular cable, because most phones have to act as USB peripheral in order to interwork with PC or Mac acting as USB host.
But, if a phone would like to interwork with a standard USB DAC always acting as USB peripheral, that phone has to act as USB host, because the USB protocol is asymmetric.
The Galaxy S3 / Galaxy Note 2 is a USB On-The-Go device.
A USB OTG device can act as a USB host or as a USB peripheral.
Simply put, a USB OTG device like a Galaxy S3 / Galaxy Note 2 can act acts as
. a USB peripheral when a Micro-B plug is inserted [regular cable]
. a USB host when a Micro-A plug is inserted [so-called "OTG cable"]