Tony Stark aka Iron Man is one of the richest charecter in MCU. Each time he shows up in a movie he uses high tech armours and other equipments.
 
 In [Avengers: Infinity War](https://en.wikipedia.org/wiki/Avengers:_Infinity_War) he using nano technology in his armour. When Banner told Tony to call Captain aka Steve Rogers, he takes a *flip fphone* to call.

 He could have used any modern technology mobiles why a flip phone? What is ThemeableAttribute significance of that in the movie??

 **Flip Phone**
[![enter image description here][1]][1]
    


  [1]: https://i.sstatic.net/p0UL8.jpg