I am having the same issue with laggy 3G. I am on the new (i think) nationwide 4399prl in cincinnati. I seem to be having trouble with wifi tethering also....I can connect but error on dl web pages. It seems like it effects the 3g when switching off tether also b/c I get connectivity errors until reboot although 3g is still active. Apps and market ok on 3g and wifi, 3g just slooooowwwww! So close.
Thanks to all that contributed to this great solution and all the help!
Thanks to all that contributed to this great solution and all the help!