If it is a screen only problem and the phone will still start, data can be retrieved by plugging it in to a computer. If you can get it started without looking at the screen.
My Galaxy S7 was warning me it was going south so I plugged it into my laptop, bought a little program called Droid Transfer and proceeded to save everything on my phone, text messages, pictures, lots more. Only thing I forgot was my notes.
A few days after I backed up everything, my phone was sitting on my desk and it exploded!! :E:E
Don't think it works on Apple though, just anything Android