Actually I think people were complaining for awhile- and train staff repeatedly told her not to talk on her phone (sorry if that isn't obvious in the link, I read two different versions of this story online).
This was from the original article I read:
"Lakeysha Beard was charged with disorderly conduct after police said she got into a verbal altercation with passengers on the train. The other passengers complained she refused to put down her cellphone, even after train staff made repeated announcements for passengers to not use cellphones, according to police.
When a passenger confronted her about her loud talking, police said Beard got aggressive. She had reportedly been talking non-stop on the phone since getting on the train in Oakland, Calif."
It seemed like they were complaining to the staff- who continued to run announcements- that didn't seem to do anything- and then a passenger confronted her and things escalated.
I loved reading about your cellphone throwing stories, they definitely made me smile! Little victories for the common man in our fight against the insensitive jerks of the world. 加油!