Take screen photo without reflection

What is more hacky that screenshot? Screen photo.

• take photo of another cellphone display to store information from it (image, email address, url, phone number)

i.e:
Situation1:It happed that some person wanted to save her email address into someone smartphone. I wanted this contact as well so I quickly made a photo. That was really "taken by surprise".

Situation2:I want to store information to someone else cellphone quickly, i just typed my nummber on my cellphone display and shoot a pic with his mobile.

But how to prevent screen reflection?
There may be no time to turn off flash so always shoot under angle while reflective surface is not positioned in the photo center.

Angle shooting and positioning "reflective" object outside photo center gives less chance of "flash reflection"