Draw Something for the iPhone is available for download in the App Store, there is a free version with advertisements, and a paid version, without advertisements. The game allows you to purchase coins - 400, 1200, 3000, and 10,000, - from $1.99 to 24.99. The paid version of Draw Something iPhone has 2,000 more words, 400 bonus coins and 5 free hints.
iPhone users can play with other friends who have iPod touch and iPad, they can also challenge people on Facebook or Twitter. Draw Something iPhone features push notification, it alerts you when it's your turn to draw or guess. If you like Draw Something, you can try other OMGPOP games, these are also available in the App Store - 1) Boom Friends (explosive puzzle game that's very addictive), 2) Puppy World (raise your very own virtual puppies on your iPhone).
The app is almost 13 MB is size, it's a relatively small file, so you should not have any trouble installing the game onto your iPhone.
If you are still considering the game, here's a iPhone review that might help you make up your mind -
To download Draw Something for your iPhone, iPad or iPod Touch, you can do so by visiting the App Store here, http://itunes.apple.com/us/app/draw-something-by-omgpop/id488627858?mt=8