Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16)
Openzone speeds are capped at 0.5mbps.
Whether that's true or not my real world experiences have always been that BT Open Zone speeds are significantly faster then using 3G in the same location.