Phonescoop has confirmed early reports that the VCAST Music upgrade for the VX8100 disables MP3 playback on the phone, at least when mp3s are saved directly to the memory card. Verizon clearly stated the music player would support mp3s stored on users' PCs. We have not been able to test this yet, but it is likely that Windows Media Player on the desktop transcodes the MP3 to a WMA file before saving it to the phone. If this is not the case and the phone is still capable of playing back MP3s without transcoding, they still can only be added to the phone's music library through the desktop. It is impossible to force the phone to add MP3 files to its music library from the device.