MP4 WILL NOT PLAY ON CELL PHONE?

Good Day:
I have uploaded all of the nessesay files to my server. The JW player works fantastic on all of the major browsers playing my mp4's.
My problem is that when I try to play it on my Blackberry cell phone it just sits there and never plays. I have several videos already uploaded to bits on the run (longtail) and when I try to open one of those videos on my blackberry it gives my the option to download the movie. Works great!
Can anyone assist me with the code I would add to my html giving the viewer the option to downlaod the clip if he or she is using a blackberry?
Any help would be greatly appreciated.
Thanks
Shepard