I don't know, but mp3 gain works well on my phone. It is pretty loud. I did have to adjust target volume to 101 or higher for some songs. Also, I haven't had any browser problems with att 4.5 upgrade. Youtube works fine too. I've also found less memory leaks with this version. It is too bad that one can't access the about menu in options to see what version you have. However, you can still see 4.5 in applications and if you want to see what version of 4.5 you have you can always see that by accessing the help me screen. To do this, press ALT+LEFT SHIFT+H. ~via BB (wap.pinstack.com)~