SMS Advertising

I noticed quite a few auto rickshaws carrying an ad for mginger. I dint know mginger until one of my friends (Kunaal) told me about it. mginger does sms advertising. Basically they send ads to your mobile phone and you get paid to read those ads. Ive just registered to receive their ads and and well i dont think id be a member for long. I'm just trying to get a feel of how things work. :)