Camera phones have become commonplace in the US market, since their introduction in late 2002. Half of all mobile subscribers in the US now own one and most are satisfied with their purchase, NPD says. While carriers earn revenue from photos when subscribers send photos to others, just 20% of consumers report sending photos wirelessly to friends or family. More than 80% of the time consumers take photos and then leave them on their phones, treating their mobile phones as if they were portable digital photo albums. 60% subscribers aren’t entirely sure what the price is for sending a picture message, which means they are less likely to do so.