I know that Castle has an iPhone but it almost seems as if Beckett's phone changes from episode to episode. Maybe I'm wrong, I'd like input from someone else. Does she have a slider, a flip, or an iPhone?

In episode 9 Love Me Dead it almost looks like she using a touch pad when Scarlett is scared and calls Castle (who is seated at this point) in the precinct, but in the walking out of the precinct scene the phone to her ear looks like a flip phone, just by the dimensions. However, in the episode 8 Kill the Messenger when she's seated on the corner of Montgomery's desk it look like she's playing with a slider…

Is it possible to have the wardrobe master on the set check in these forums now and then to confirm or verify these prop questions? That'd be wicked awesome.