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Samsung has hit a wall.

Apple has paved the way of smartphone technology, they work hard to lead the way by developing in-house their own CPU.  Of course, Apple iPhone Ax series doesn't have fancy quad or more cores like Samsung or a phablet size ambled display.  

But Apple is working with a strict power budget. Size of the iPhone battery has been kept relatively the same since the first iPhone and Apple is working really hard pushing more performance with the same power budget at each iteration.  This is where the competition just doesn't keep up, they need to sacrifice something to keep up with the iPhone performance while offering bigger and more power hungry display. 

This is why the monstrous Galaxy Note 7 has failed, pushing the power budget of its battery to the limit.