Samsung Galaxy S4 Duos (GT-I9508C)

Overview
This phone appears to be a Duos model (that is, it is a dual SIM phone).

Per the FCC SAR testing report..
 * The Main antenna (GSM 850/1900MHz / UMTS Band 2/5) (Tx+Rx) appears to be located at the bottom of the phone.
 * The Sub. antenna (UMTS Band 5) (Rx) appears to be located at the top left of the phone.
 * The GPS antenna (Rx) is located at the top right of the phone
 * The BT/Wi-Fi antenna (Tx+Rx) is located at middle left of the phone (under the GPS antenna).
 * The NFC antenna is integrated into the battery (standard model being B600BC).
 * AP mode in the 5GHz bands are not supported with the Wi-Fi chip due to a firmware limitation.

On MobiLeaks (Dutch)
 * covering passing through Bluetooth SIG