Apple has announced that it has launched a free repair program for these phones due to malfunction of some iPhone 6s and iPhone 6s Plus models. The exchange program covers specific models.
A limited number of devices manufactured between October 2018 and August 2019 are included in the free repair program. You can check your device’s repair program by entering your serial number in the appropriate field on Apple’s website.
Repair inquiry page
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Some iPhone 6s wo n’t open after closing. Apple acknowledged that this was a chronic problem and explained that one of the components on the phone was causing it. If you have your phone repaired and paid for this problem, you will be able to get your money back from Apple.