On commuter trains, the cell phone usage is very annoying. People talk loudly. Do cellphones have enough sidetone or too much anti-sidetone circuitry?
At my local convenience store a customer was loudly yaking away on her cell phone, including liberal use of profanities, and created a disturbance. She utterly ignored requests to go outside; as if her phone conversation was more important than anyone else. A lot of cell phone talkers have that nasty attitude.
Talking while driving is very distracting. Regularly motorists yaking pull up to the wrong lane and then block traffic trying to switch over. They still don't hang up even then.