I will be upgrading my I580 to an Evo 3D when they come out...I know nothing about these things to speak of...I did buy a Lexar 32G card for it already...Do I want to wait till I install the card into the phone before I transfer my MP3's to it? Also what app would I want to install first, apps2sd? I think that is so you can install apps on the card rather than internal memory?....Thanks in advance for your help.........HJ