With the cost of mobile phone calls already dropping sharply, Virgin Mobile USA plans to announce a way that people can talk for no money at all. A minute of airtime typically cost from 3.5 cents to 10 cents, down from more than 25 cents a decade ago. The program, called SugarMama, lets people earn one minute of talking time by watching 30-second commercials on a computer or receiving text messages on their phones, then answering questions to prove they were, in fact, paying attention. Virgin Mobile, a relatively small cellphone carrier with four million mostly young customers, is aiming the program at teenagers, who can earn up to 75 minutes of free talk time a month. The program is gone but here is the original NY Times article.