As seen on public transport daily.....
No1. "The Wine Glass". holding up in front of you with one hand like clashing glasses. cheers
No2. "The Brick" holding the device down by your waist as far as it will stretch like it is really heavy.
No3 "The Keyboard" As it sends email this must be how to do it. place on flat surface and use index fingers to type.
No4. "The Secret Agent" One arm straight down by your side and eyes pointed down without moving head. Much like a sideways brick
No5. "the Gamer" Double thumb action where the handheld could be a GameBoy