Mogul and Phone as a Modem

[MountainDew]

I have a phone as a modem plan, I have used Internet Sharing on the Mogul and on Phone as a Modem mode I been getting high and stable speeds 1.2Mbps around that ballpark, using Sprint PCS the internet connection sharing went on it's highest peak 600Kbps...

Can someone else tell me if the same thing has happened to them? Maybe sprint is limiting the Sprint PCS NAI to make people sign up for PAM plan to get better speeds? I did a lot of speed tests using http://www.speedtest.net