Using an iPhone on the Telus network in Ontario on a "Flex" plan. Start at 1GB and move up from there! 1 - > 2 for $20 extra, 2 -> 5 for $20 after that. The plan naturally fits my bandwidth needs with no throttling. Tethering at no charge by the way. I've also seen 150KB/s both up and downstream on our 3G network tethered. Works for me.