In the case of Latin American carriers, the plan is that customers could get one free text message for every 10 ads viewed, to as much as one free text for every three ads viewed. There is a daily limit, to prevent customers from abusing the rewards program by calling and hanging up over and over again to see more ads. They would also get 100 free text messages for signing up.
Latin American cell plans don't often have the same unlimited text-message plans that customers in the United States have.
"Text messages in those markets are still quite expensive, when you compare to the U.S. where you have unlimited text messages," Angelone said. "It's a big reward for the consumer."
So if it were to roll out in America, he said a different reward system would be implemented, like rewarding with minutes.
"We do it case by case, country by country, because markets are very different," Angelone said.
Read more here: https://miamiherald.typepad.com/cache_carey/2010/03/myscreens-cellphone-advertising-rewards-users.html#storylink=cpy