You can sign up here to be part of the class action settlement.
You may be entitled to settlement benefits if you are or were (1) a United States owner of an iPhone 6, 6 Plus, 6s, 6s Plus, 7, 7 Plus, and/or SE device (2) that ran iOS 10.2.1 or later or, in the case of iPhone 7 and 7 Plus devices, that ran iOS 11.2 or later before December 21, 2017, and (3) you experienced diminished performance on your device(s).