Don't think it's cross platform, but I maybe mistaken. But what I have seen so far and read on the web, it's not looking good.
CD-Key is required to play multi on PC
You could try this one
12345-ABCDE-54321-EDCBA-COBOL
Now available on steam to download, still a pre order you can't play. But you will have it for the 24th September 2010.
Price £26.99 - 10% off
Just a heads up
Sorry guys, I have so many none tech mates that have bought the iphone. And I have to say from the specs I have read and from from playing with one for several hours. I made a different choice. And I am no noob when it comes to tech. Thats my pennys worrth.
Sell it later, it's good for noobs on planetary exploration. Without skills, you can't buy em on the market. So when a few noobs have em blown up. Sell your's