[post_break]

Are you the person who calls someone after a text message? Cause that's how you end up with a silent ring tone.

[cpwright]

I don't use text messages much (typing on a phone is too low bandwidth); and about 25% of my work-related instant messages will turn into a phone conversation (at least 50% of those calls will add VNC to look at code). Both parties can talk with much lower latency and higher bandwidth than they can type.

[vehementi]

It's about more than "I can save the most of my time by arbitrarily interrupting people because my talking is faster than my typing".