The Feds were busy examining a model of the Samsung Galaxy S 4 that had a 850 / 1900 GSM radio, 3G connectivity through 850 / 1900 WCDMA frequencies and support for LTE Band 5. Shh. Here's a little secret. The AT&T version of the phone runs over LTE band 17. O.K., maybe that is no secret. Still, it meant that the version of the Samsung Galaxy S 4 visiting the FCC was an international model that offered some 3G connectivity for AT&T and T-Mobile customers in the states
The Samsung Galaxy S 4 will be launching in the U.S. at the end of next month and that version too, will have to get a physical from the FCC Doctors.
source: FCC via Engadget