It is a Sprint thing and their new "Spark" networks, it uses three different frequencies so the phone needed three different radios and voice and data come from only one antenna, S4s for instance could be connected to voice and data from two different antennas allowing you to surf while talking, and yes I agree Sprint should have made that information available, not to mention the problems they are having with the S5 scanning for "Spark" tri band networks and reverting to 3G since not all towers have been upgraded to full LTE on all bands (25,26 and 41), I had to manually disable two antennas to be able to use 4G, ridiculous.
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