TomTom Car Kit - Am I missing something? iPhone won't fit

I got the TomTom USA software because of the holiday sale as a backup GPS, which became my primary GPS on a recent trip after my old Garmin died. Not wanting to hold the phone in my hand the whole trip, I picked up the TomTom Car Kit at an Apple store.

Unfortuantely, I can't seem to be able to make the iPhone fit into it. All of the reviews say that the phone gently locks into place, but the only way I was able to get mine to fit was by forcing it, which subsequently cracked the black plastic casing at the top of the phone (no biggie I guess, this phone already has a crack in the screen and is rather scuffed up).

I don't have a case on the phone... just the stock iPhone 3G. I can't find a way to make the car mount give any to allow the phone to fit into it...

What gives??

Really, really frustratingly odd. I'll take a picture of it and upload it so you guys can see when I get home from the office this afternoon. I just can't understand what the deal is.

It is a 3G, btw.

Ugh, I wonder if that may in fact be the reason. I asked the lady at the Apple Store for the TomTom car kit, that's what she gave me. Bet I neglected to say "iPhone." D'oh!