Telephones have evolved significantly over time. In the early 1900s, telephones and telephone booths were present in large cities like New York. By the 1940s, mobile telephones were invented. Phones became more affordable and commonplace in the 1980s. The 1990s saw the launch of SMS text messaging. Modern smartphones can take photos, videos, access the internet, and support apps. Mobile devices are increasingly being used for education through BYOD (bring your own device) programs and mobile learning apps. The future of education involves widespread adoption of tablets and smartphones for learning both in and outside the classroom.