Google does not like you to use external Micro SD card on your Android devices. Therefore, you won’t see SD card slot on Google Nexus devices. And starting Android 4.4 KitKat, Google removes the ability to write files to MicroSD card. So your newly installed applications are stuck with internal storage. No worry, SDFix is able to help to solve this issue. So your Samsung Galaxy S4, Note 3 will be working fine as before. However, root access is required.