Could you speak up? The people on the next train can't hear you.

If you have headphones plugged into your phone so you can listen to music while you ride transit, you should consider taking them out to take a call.

Or you could just do what some lady on the skytrain did today and leave them in and yell into your phone because you can't hear yourself speak. Because I know that I really enjoy listening to a one-sided conversation, from across the train and over the music playing in my own headphones.