I'm sure most people knew this but what with the premium add on charge of $10, I wanted to be sure. Since I am going through a refi on my mortgage, I didn't want another credit check. Sprint confirmed for me, in writing, that a new check is not required if you are going through an upgrade...only at "original" activation. Just an FYI for anyone out there upgrading to the Evo on the 4th. Should make your time in-store pretty fast.