Q: Dear Support,

I wonder why the MP4 low res doesn't match with IPHONE 3 version 4.2.1 ?
I have to change options twice times along to make it OK
one time for all with original size and one for only MP4 low res with a resizing to 640 X 360 it's the only way I find to make the movie readable on IPHONE 3?

A: The 'original size' option is used for all the formats (Webm, mp4 (HTML5), OGG, mp4 (Flash
Fallback)) but the mp4 low res.
'mp4 low res' option creates the video the size of which suits for iPads and iPhones.

So, if you want the video to play on iPhone, you should choose mp4 low res option.