Can't advise on compression because I also use Movie Maker, but ff that phone is WM5 based, get TCPMP. It's a great media player for PDAs. Linky (it's down at the moment, try later). I used other programs for compressing in the past but they were slow and inefficient. Just stick to MM or if you want a really good compressor, download Premiere Pro and use the Adobe Media Encoder. You could also try DivX Create, it's got a setting for mobile devices but to play it you will need the program above.