Motorola V551 / V330 / V547 / V555 / V557

Alright, I can't figure this out. I want to put a full length 3 to 4 minute music video on my phone. I use QuickTime Pro to export my videos into the 3gp format. I have been playing around witht he fps and the sound but every time, after I convert it and then transfer it to my phone there is never any sound output on my phone. But the visual is great. What are the proper settings to be able to have the best vdeo with the sound? Thanks a lot!