Here it is! Here is Apple’s next problem!
Is your new iPhone 6S or iPhone 6S Plus have the Samsung or TSMC chip?
Good news if you have the TSMC chip, your phone gets 2 extra hours of battery life. How awesome is that. The performance is roughly the same, so the only benefit is the battery life.
So how can you tell if your phone contains the lucky chip? You have to download and install an app called, Lirum Device Info Lite, which displays on the Model Information screen whether the device has a Samsung (N66AP for 6s Plus or N71AP for 6s) or TSMC (N66mAP for 6s Plus or N71mAP for 6s) chip.
Source: MacRumors