Apple has taken an "If it ain't broke don't fix it" approach to the iPhone SE and in doing so has created the most powerful 4 inch smartphone on the planet by using components from the 6S,  (A9 chip, the M9 co-processor,.2GB of RAM, 12MP iSight sensor and a larger 1624 mAh battery). The exterior identical in almost every way to the iPhone 5s, which launched in 2013.