I own a repair shop in the heart of Happy Valley Oregon. My website if you would like to contact me is https://repairit.tech
That has been a problem ever since the iPhone 5S. If you break your home button than sadly your touch will not work. There might be a way to clone the code from the chips on the home button to your new home button but i think anyone that would be able to do that would have to charge more than most would be willing to pay. lol
There is a good chance that the camera is bad. Try to rub it with a Q tip and some alcohol if that does not fix it try to clean the glass of the screen from the inside.
Very rarely do you have to replace these guys. If your earphone piece ever seems to go quiet on you then most likely it is just dirt that is clogging the grill between the ear piece and your ear. To fix this you need to remove the ear piece and clean out the grill from the ear piece side with a toothbrush and alcohol. Dont attempt this while the screen is on because you can either destroy the ear piece or also just clog it.
I have noticed with some cheaper 6S screens that the proximity sensor will not work. If that is the case for you make sure that you scratch off the black film that is on the glass where the proximity sensor is suppose to go. It is not the prettiest thing but it is functional!
Always make sure that you disconnect the battery on the iphone 6s and 6s plus. I have seen many 6s with blown resisters on the either the backlight power rail or the display power. Both of which usually blow the pad off as well making the phone very difficult to repair. If you would like to avoid a data recovery situation make sure to unplug the battery right away. Don't be lazy guys!
The battery replacement is very easy but i seem to always break the adhesive tabs and end up having to either fish it out with tweezers or just using a spudger to get the battery out! Great guide!