How to change iphone name?

It is very easy to change name of your iphone :

1.Plug your iphone into your computer

2.Open iTunes

3. Double click on the name of your device

4.Now you can change its name.

I hope it helps

How to play dat(video) files in ubuntu?

It is a two step process :

1. Download VLC player from software centre using Application-->Ubuntu Software Centre-- Type VLC

2. Open terminal and type this command : vlc vcd:///dev/sr0

It start your vlc player with your cd running.

I hope it helps