I had a Galaxy S2 (AT&T) with Go SMS Pro and was able to send video files up to about 90 seconds long via MMS. I just upgraded to the Galaxy S4 (still AT&T and still Go SMS Pro) and can only send video files that are about 20 seconds long. I have changed the settings to allow the largest video files -- I have adjusted my camera settings to a lower resolution -- I have manually entered the APN and proxy and ports and mmsc.. Still can't get the video length to go over 20 seconds.. or about 375K. HELP?!?!