It's not a cellphone, but you should also read CC Aiken's
Something The Cat Dragged In, which has a conversation similar to the one you describe and is hilariously funny.
And once you've read The Spying Game, don't miss out on the rest of Irene's stories either! I recommend
In Cat's Corner especially - one of my all time favourite LNC fanfics.
You'll find all of these stories on the
Fanfic Archive and at
Annesplace Of course, none of this means that authors can't tackle the premise anew and bring some fresh perspective to it. You go, guys!
LabRat