Tony Stark aka Iron Man is one of the richest charectercharacter in MCU. Each time he shows up in a movie he uses high tech armours and other equipments.
In Avengers: Infinity War he using nano technologyuses nanotechnology in his armour. When Banner told Tony to call Captain aka Steve Rogers, he takes a flip fphonephone to call.
He could have used any modern technology mobiles why a flip phone? What is ThemeableAttributethe significance of that in the movie??