With a 3g phone you could download the video from the laptop to the phone (via cable) and send it from there as an mms.
With my 3 network PAYG 3G phone I got an email addy. So in that instance you could email the video from the laptop to the mobile and then text it as an mms.
From what I remember emails are limited to about 3mb, not sure about mms limits. Sending as email or mms will not lose data, whereas live video calling can and probably will.
If you need to convert the video file to mms compatible format use Nokia Multimedia converter availiable here:
http://www.forum.nokia.com/main/0,,034-63,00.html