Apple's iPhone 6S is the second edition, upgraded version of the Apple iPhone 6, released in 2015. The iPhone 6S looks pretty much exactly like it's predecessor, the iPhone 6, however it's got some major changes within that result in a much more powerful smartphone.
These changes include a fairly dramatic performance boost provided by Apple's new A9 CPU, an addition of a force sensitive touchscreen called '3D Touch', and the introduction of a new chassis material - 7000 series aluminium alloy, providing a stronger body.
Also, both the front and rear camera's have been upgraded to higher resolutions, and the Touch ID fingerprint scanner works a LOT faster (as anyone owning a iPhone 6 would know about). The iPhone 6S is available in four colors, and three capacities - 16GB, 64GB & 128GB (We recommend 64 or 128 as 16 isn't really enough for most people)