My first comment was a simple observation on being prepared, but if since you are trying so hard to come off as the cliched millennial ******, I'll rise to the challenge.
-First 911 is not a number to call because your car won't start, emergency responders have important things to attend to, especially in the cities.
-Tow companies or AAA would be the correct first call, but when there is a snow storm or severe cold weather, you would be lucky to get an answer and even if you do then you better be prepared to wait a couple hours. A long wait in -30 degree weather.
-Family and friends was your other suggestion, but since I am an adult, I find it silly that my friends and especially my mommy and daddy should have to wake up in the middle of the night to rescue me because I think the idea of jumper cables, a car starter, or blankets is outdated.
What you are advocating is not that your cell phone has rendered preparedness outdated, but rather that you have a cell phone so that you can contact people that are smart enough to be prepared.