iPhone 6+ has stopped responding to touch

Let me clarify: by touch I mean the sort of thing that is required to put in passcodes. I don't mean it won't respond to fingerprints.

So yes, I can spend several hours returning to the Apple Store, but i was hoping not to devote another day to this.

Yesterday I was there when I noticed that for no good reason my camera was cracked. I had done nothing untoward.

Also, when they were explaining that the way to fix a broken glass cover on the camera is to replace the entire phone, they noticed that the old phone was bent. I gather that just to use you phone normally gives rise to these problems and then to replace them we have to pay (even with Apple Care). And this sort of replacement can only happen twice--even if I am not guilty of anything.

Having devoted half of yesterday to replacing my phone, I'm hoping I don't have to make the long trip by bus again. The phone does not respond to touch--at all. But it did for one day. I also will have to go through the process of setting everything up again.

By the way, this time I did notice a while line at the top of the screen that somebody else mentioned.

That should be "white line". The color white. I now notice that if I press really hard, the phone responds.