The universal emergency number in France is “211” (similar to “911” in the U.S.). When you are in Paris, France and using a U.S. cell phone, how do you dial this emergency number? Do you use the the +33 prefix and then dial 211?
First of all, the Emergency number in all EU countries, including France is 112 not 211. If your US phone has international roaming activated you can call this number just like locals do, no need to add +33. Just dial 112.