Mobile phones service in the states!?!
 

Me and a bunch of guys are going to spent a few weeks in Las Vegas...
We are all bringing our cell phones from Denmark.

We would like to somehow get some temporary SIM/Chips for our phones so that we can make calls locally instead of spending $$$ on calls that is routed from Las Vegas to Denmark and back to Las Vegas (was there last January, and it cost me a lot :-))

Any suggestions?
In denmark we have a system wher you can buy a card with 20 minutes or more and it has it's own number... Once you have spent your minutes, you simply just throw it away...

Anything like that in the states?

Yep. You can buy pre-paid cards at just about any gas station.