My EVO 4G LTE has these two separate categories of storage, "phone storage" being the advertised 16GB (although really only about 9GB, like the S4). The "internal storage" is apparently where apps default to, and where other system files are located (2GB for apps, 4GB for other stuff it seems). Does the S4 also have this separate area for app installations, or are apps installed into the 16GB section by default? Just trying to figure out how much TOTAL space there is on the phone. Thanks.