SMS.ac Inc. is a mobile ata and Internet communications company based in San Diego, California. The company provides web and mobile distribution and billing to people buying and selling digital content (video, music, and applications) through (SMS) mobile billing. SMS.ac's website integrates its mobile billing technology with social networking services like photos, videos, music, and comments. SMS.ac has over 50 million registered users in more than 180 countries, which makes it the largest community of registered mobile phone users in the world.