[kdj67f]

Most carriers support .3gp and .3g2 video formats for sending to any phone, even dumb phones. The frame sizes are usually 176X144 (qcif) which, when compared to the VGA 640X480 resolution makes them look small. Your friends with newer phones and devices can probably send .mp4 videos, which have usually a 320X240 res, which will look more natural (quarter the screen)

Save them and open the vids in tcpmp or wmp and they can usually go full screen. I think it is a limitation in arcsoft that shows them at full res, not full screen.