Iwata Let's see... phone calls used to have more lags in the old days. Although underwater cables are frequently used for international calls now, satellites were used before. Stationary satellites are located about 36000km away from the surface of the earth. So the voice is transmitted to 36000km above, and then 36000km down, which is over 70000km in total. When someone says "Hello", and the other answers "Hello", the signal makes two round trips, which is a total of a little over 140000km. Light and electronic waves are transmitted about 300000km per second, so the signal takes about 0.4 seconds to be transmitted 140000km. So when you say "Hello" and the other answers "Hello" back, there is approximately a 0.4 second lag.