If the power button of your iPhone 6S Plus does not work properly, this may happen because of the defective iPhone 6S Plus flex cable. The flex cable is an essential element of the mobile phone because it connects its various units. The flex cable of smartphones can be damaged, as well as that of the old devices.
As this is an offer that includes the
iPhone 6S Plus power button flex cable + the repair, then you should absolutely take advantage of it.