That's my question though - why did it even matter to OP that it was a teenage girl? How does the age or gender of the person who bumped into him make a difference in the fact that he dropped his phone?
Well it was California so I can say from years of personal experience she probably told him to watch where he is walking and called him no shortage of profanities while walking away. God I don't miss that place for a second.
In Saaaannn Frraaannnsisco...