Was on the phone and then it suddenly shutdown after the call was ended and now won't turn back on even with charging.
Screen went pixelated and then would light up a few times and now get nothing back.
iPhone 6s
Try the steps here: If your iPhone, iPad, or iPod touch won't turn on - Apple Support
You may consider following the steps outlined in these articles
What to do if your iPhone or iPad will not turn on - Apple support
If the screen on your iPhone, iPad, or iPod touch doesn't respond to touch - Apple Support
My iPhone 6s suddenly shut down and now won't turn on or charge
