The specific item that is on the IARC Group 2B ("possibly carcinogenic") is "radiofrequency electromagnetic fields", which includes exposures due to cell phone

The specific item that is on the IARC Group 2B ("possibly carcinogenic") is "radiofrequency electromagnetic fields", which includes exposures due to cell phone use-- cell phone radiation specifically is not classified. So, if your car has keyless entry, your car keys would technically also be on the list.