The adapter is detected immediately by the smartphones S3 and S4 and thus enables a simple and inexpensive manner, for example to connect a USB memory stick. I was disappointed but that the S4 mini adapter does not recognize and he consequently can not be used. This is however not the adapter, but the smartphone that has no USB host function. Is incredible that is claimed both the Samsung website as well as on their hotline which part is compatible. They know not appear to their own devices. The USB adapter can not blame the.