Unfortunately, as far as I've been able to figure out, the big (really big) drawback of GVM is that there's no way out.. except through hotsync. It can't write (or read) SD cards, and it can't access bluetooth directly either. The installer part of GVM can read and install files (.prc or .pdb) from SD, but there's no way to do the opposite (filez, for example, can't see the cards).