I took some pics of what mine looks like. It's right next to the SIM slot. Kinda annoying, but nothing too serious. I might go get it replaced. Should I?
Looks like someone tried to prize the SIM card holder out with a screwdriver rather than poke a paperclip into the appropriate hole.
Which, if it's a new phone, and you didn't do that yourself, is kind of worrying.
Assuming you didn't cause that I'd make a fuss in a store - a brand new phone should not have been attacked by someone with a screwdriver and no clue.