Kimberly Reynolds presents statistics showing the pervasive growth of mobile usage and opportunities for mobile marketing. Some key stats include: 4 billion people use cell phones but only 3.5 billion use toothbrushes; 91% of adults keep their phone within arm's reach at all times; and 90% of text messages are read within 3 minutes. The document advocates for responsive design and screen-agnostic websites to ensure sites are accessible and usable on mobile to capture this growing mobile audience.