While Ethernet and WLAN typically have latencies on the order of 1-10ms, mobile networks (GPRS, UMTS etc.) have much higher latencies (200-400 ms for UMTS, even more for GPRS).
Why is that?
I assume there must be some inherent technical reason, but what is it? Does it have to do with how data is transmitted over the air? And if it is because of the wireless transmission, why does WLAN have much lower latencies?