The mobile carrier, Sprint has recently released a new software update for the Galaxy S6 and the Galaxy S6 Edge which basically brings support for Samsung Pay. Samsung Pay is the mobile payment service introduced by Samsung but this service will not be going live in the US till next month.
Plus the software update is necessary to get support for Samsung Pay while newer devices like the Galaxy Note 5 and the Galaxy S6 Edge+ have support for the service straight out of the box.
Apart from Samsung Pay the new update also brings live broadcasting through YouTube feature which was basically introduced with the Galaxy Note 5 and the Galaxy S6 Edge+.
Moreover the update also includes UI tweaks, bug fixes and support for High Quality Audio with Samsung headsets.