How to use the 3DTouch of iphone6s? Why does the delete function always appear when I press it?

The main purpose of "3DTouch" is to quickly browse short messages, pictures and so on.

First confirm whether the "3DTouch" function of your mobile phone is turned on, and check it in Apple's Settings-General-Auxiliary Functions-"3D Touch".

3. Open the SMS interface, and gently press "Press" on the SMS you want to browse, but this is not a long press. An interface will be displayed, where you can browse the content of the short message, and swipe up to quickly reply to the short message. The same is true for browsing pictures. Press the picture you want to browse gently and forcefully, and the picture will "float".

4. The app on Apple can also use this function. Press "Press" lightly, and the application will open a menu selection.