Lance wrote "Oh, 3G also has more latency than EDGE/GPRS"
Not true. GPRS is about 700ms round-trip ping times, Rel99 3G about 200ms, and HSDPA about 130ms. Try it by pinging a server if you don't believe me.
There is a difference in their cold-start peformance - 3G escalates the connection speed through a number of steps each time upgrading the mode and bandwidth. These transitions can take a 1 or 2 seconds to complete - and so for a small amount of data such as a very simple webpage GPRS can beat 3G - but it quickly loses this advantage once the download exceeds a few tens of kilobytes.
Very surprised to learn Buzz's WiMax had a latency of ~1second. Sounds like a problem specific to their network (congestion, overloaded equipment?) unless others can confirm this is generally true for Wimax?