On phone readings i don't think there should be any problem in reading a person at all. Using pictures by post for a reading is ok i think, The internet i'm out of my depth here. I work, as a Shaman. I dont do readings , i heal the earth first people second and remove "lodgers". I pick up from a phone line, map or picture, A person or place can knock me sideways. I was asked only last Friday to look at someone very famous as a medium on TV to see if his aura was ok repair it and remove spirit from him, etc etc from a internet picture before he went on stage. I had no problem by phone, or have i using maps worldwide to identify problem areas near a home in a home or five miles away. If a dummy like me can do that, theres plenty of gifted people out there that could do that, if they tried.
One thing i would warn about to those who have tried and failed by phone or don't like it , is try again. The blockage or revulsion thats experianced could be sensitivity, a phone line not only brings energy to your person, it brings energy from another person and the building there in, could repel you and close you down fast. I can work reciving energy and sending it by phone or remotly from a map or picture. Many others can do this once there aware,its not a one way street.
Best Geofizz