He's HOLDING the phone to his left ear.
Ears do not cross hemispheres.
The Big Bang Theory Season 2, Episode 15
I hated them for
HOLDING me prisoner. I wanted to hurt them.
Game of Thrones Season 3, Episode 2
Now? You realize I'm your boss,
and I am HOLDING my penis?
The Big Bang Theory Season 5, Episode 17
...but the other hand
HOLDING the severed head of a tiger.
The Big Bang Theory Season 8, Episode 21
Maybe they'll call Imperial officers
to take us to a HOLDING cell on the Death Star.
The Big Bang Theory Season 8, Episode 19