Creating cellphone layouts

Hello:D

I’ve just bought myself a new phone (sony ericsson w810i) and im so caught up with it. Taking pictures all the time and so on. I know there is a way to create cellphone layouts, I guess with PS or something. I have googled a lot but can’t find any tutorials or anything about it. Can you help me?
Do you know of any good tutorials or somthing at all?

Cause this would have been real cool:D I could show off to my friends and start a smal buisiness and take money or somthin for it! haha. already doing that with custom name-logos and stuff created with flash;) You should do the same! hehe…

anyways… point me to the right direction will ya?

Peace:)