According to The Wall Street Journal, John Thune, the chairman of the U.S. Senate Commerce Committee, wrote to Cook and asked a few questions about the company's decision to slow down the old iPhone.
Apple and last month admitted that they would limit the processor speed of older iPhones because of battery problems, and have since been criticized by all parties.
In December last year, foreign users said he found Apple's evidence of a slowdown in the battery and processor speed of the older iPhone.
In 2016, Apple released the iOS 10.2.1 firmware, which fixes the unexpected shutdown of iPhone 6, iPhone 6s and iPhone SE, but Apple did not disclose the method of fixing the problem.
Last month Apple released a statement in which the company said it is a move to address the problem of accidental battery shutdowns and other issues. "This technology is also used in the iOS 11.2 firmware to ensure that the iPhone 7 There will be no accidental shutdown.In addition, Apple also said it will continue to use this technology in future products.
However, this decision Apple eventually annoyed consumers, some consumers began appearing in court with Apple.Up to now, within the United States has more than 30 consumers will be brought to court in Apple.Including consumer rights law body Hagens Berman, which brought it to court in 2015 when Apple bids for ebook prices and eventually paid Apple a $ 450 million indemnity.
In the face of consumer dissatisfaction, Apple finally apologized for this time, and cut iPhone battery replacement price, down from 79 US dollars to 29 US dollars.
Thun wrote in the letter: 'Apple's solution has given them further criticism from consumers because they do not provide consumers with free battery replacement services.'
Thun also inquired whether Apple is focusing on consumer complaints about slowing down the iPhone and whether Apple will offer a rebate for users who previously replaced the battery at full price.