When we unfold  a    5G   FoldingSmartphone-that-can-unfold-into-a-15.6 inches-Tablet   into a    15.6 inches Tablet ,    and place it on a Table in a  VERTICAL  POSITION  and place   a    wireless/bluetooth    keyboard and a  wireless/bluetooth    mouse  in front of  it , it looks as if we are  sitting/working  in front of a   15.6 inches 5G Cellular Tablet ,  and in that   VERTICAL POSITION ,  we can use it to make telephone calls to any  landline    telephone/number  [ 1 ] and reply telephone calls from any  landline  telephone/number    [ 1 ] and make phone calls to any 5G smartphone and reply phone calls from any 5G smartphone.