Characters keep on referring to the card found wedged behind the victim's rear molar as a SIM card. It is not a SIM card, but a micro SD card. Also, most people would be quite unable to wedge something like that behind their rear molar unless they had a particularly unusually large gap there; a micro SD card is similar in size to a micro SIM card, but considerably bigger than current nano SIM cards, and also considerably thicker.
When Sienna is about to shoot Lucas near the end, Lucas grabs his leg before the shot is fired.