According to a report by South Korea's The Electronic Times, TSMC is to become the sole supplier for the next generation AX processor in the upcoming iPhone 7. According to the report, TSMC won the contract with Apple over Samsung due to its more efficient 10nm manufacturing process, and is expected to go in full production in June. Both TSMC and Samsung are the suppliers for the A9 processor in the iPhone 6s. Unfortunately for Samsung, users noticed differences in heating and battery life between the chipsets from the two companies, with the TSMC one coming out the better of the two. This wouldn't be the first time Apple went with just TSMC. After a long time of relying on Samsung to supply its chips, Apple switched to TSMC for the A8 and A8X, and even the A9 would have been made entirely by TSMC had Samsung not stolen TSMC's trade secrets, which is said to have helped the company get the contract with Apple. With the A10, TSMC is likely to be the sole supplier for Apple, assuming it can keep up with the demand. Source ...
Source: http://www.gsmarena.com/tsmc_allegedly_to_be_the_sole_manufacturer_of_iphone_7_processor-news-16569.php