The Galaxy S6 has been criticized for only offering about 23GB of usable free space on the 32GB model. Some people will want to opt for a higher capacity phone in order to make do without a micro SD card slot. The problem herein lies with those on AT&T who wish to purchase a Galaxy S6 Active. Until recently, the Active only came in 32GB for all color configurations. Now however AT&T is now offering a larger 64GB memory option for those who wish to purchase a Galaxy S6 Active. It is still unknown if Samsung plans to release the Active variant of the phone outside of the US, though It is a little disappointing that this decision was made so late in the life of the S6's product cycle. The Galaxy S7's rumored release is already around the corner and slated for a Q1 2016 launch and even though the rugged version typically comes out a few month later we still wish we had 64GB from the...
Source: http://www.gsmarena.com/at_t_begins_selling_64gb_variant_of_galaxy_s6_active-news-15267.php