I have a 8gb iphone 3g and a 30gb ipod.

I am trying to load mp4 video onto the iphone but they wont sync but sync fine onto the ipod.

Does anyone have any ideas, i want to watch on the bigger screen of the iphone

Why wont they sync !!

Many thanks

Have you got them ticked in the movie tab??

When I want to add mp4 videos to my iphone, after adding them to itunes, I have to go in to the movies tab of the iphone and tick them. Then I press apply changes and the iphone syncs and then they get added to the iphone. I know with my ipod classic all I have to do is add them to itunes and they automatically sync.

tick where ?
In itunes library or iphone itself ?

Ok when you sync your iphone to itunes, you should be able to see your iphone under devices (on the left hand side of itunes) underneath the tabs for library and above the tabs for playlists). If you click on that it will display your iphone and will tell you how much space you have available this is called the general tab I think. You will then see other tabs for music, movies, tv shows etc. You need to click on the tab for movies and select the videos you want to put onto your iphone. Then press apply and it will sync the movies to your iphone.

As above. Or you can select the tab for Films or TV shows (whichever one the video is in) and tell it to automatically sync all films and TV shows. That way, new ones will always sync to your iPhone.