The first $5 is paid out instantly via an Amazon.com gift card code after signing up with a referral link, $1 more after completing registration, and $5 more per person invited (5-15 invites per person). I was able to do this on my iPhone as well as my roommates iPod touch using Google voice.
You don't have to use any real information, and the app can be deleted right after you get your initial $5 gift card code.
I have 9 invites remaining with that link above.
Any questions, just post here!