So, I've been kind of pissed that the iphone seeminly had more robust potential as a pentesting platform, compared to Android. In a, shall we say, moment of discomfort, I shitcanned AT&T for Sprint and got a Galaxy S phone. And of course, there's no native port of Metasploit yet.
If you're in my boat, fear not, there is a solution: Chroot'd ubuntu. Just follow the instructions at http://bit.ly/g2jQmz to get yourself a functional Ubuntu environment, then load it up with your tools of choice. Metasploit works quite well!