Slide to answer does not work on iPhone 7

I'm also having this problem. It seems like it is the first call of the day where I cannot slide to answer the call. IOS 11.0.3. Original everything. Screen is visually not damaged.

I reset the phone after each time I have this issue, and it generally works for the rest of the day, but I know that when tomorrow comes it will not answer the first call.

Hello again! What do you exactly mean underneath “Not let you slide to answer“? For example, if your iPhone 7 is in Sleep mode, then ”Slide to answer“ slider appears with an incoming call. Otherwise, if your iPhone 7 is woken up, only “Answer“ and “Dismiss” buttons would appear. Probably you’re talking about an iOS bug that doesn’t allow you to use “Slide to answer“ slider. If so, then check wether you use the latest official sistem software on your iPhone. Because if you use iOS Beta software, some bugs may appear.

If you want to reply on a pop-up iMessage notification you have to 3D Touch on it (press, not just tap).

Correct, you tap to answer.

That is assuming it is a text or iMessage, which you may be correct about. I took it to mean answering a telephone call. Only the OP knows for sure but he now has both ways covered.