For some reason I read "kicked" in your OP. Sorry.
If you dropped it from a height of 2-3 feet, that phone can gain a lot of speed and hence, force.
As for your other question, he might be able to call the CC company on his own if he has his own card (under her account). He can call himself as a card holder (which he would be) and get the details. Otherwise, I don't see anyway for him to get the exact details of her card without her.
i didnt even DROP it. i was just lying down typing and then i go to my phone to get it then it slips and hits it. it was maybe 6 inches to a 1 foot away. at first i just thought it landed on his keyboard then i took a ook and i was like