Here's what's inside an Apple iPhone 6s: teardown reveals 2GB of RAM, it's easy to get it repaired
Additionally, the on-board storage of the phone is courtesy of a Toshiba THGBX5G7D2KLFXG 19 nm NAND Flash module, while the majority of other hardware components are similar with the ones in the iPhone 6. Interestingly enough, the lightning cable now comes with two microphones.
Undoubtedly, one of the more curious components inside the iPhone 6s are the 3D Touch display underpanel, which doesn't seem to be fused to the display itself, and the new taptic engine, which reaches its operational peak after merely a single oscillation. iFixit even took a nifty X-ray footage of the taptic motor in action.
As usual, iFixit gives its repairability verdict at the end of the teardown and the iPhone 6s gets 7 out of 10 points. It's lauded for the easy access to the display and the battery. Removing the latter in particular is relatively a no-frills experience, if you have the right set of tools, of course. Still, the device is criticized for its Touch ID cable which is paired with the logic board and Apple's use of proprietary screws (pentalobe ones).