The cell phone, now the most widely used medium in Asia, has major educational implications. Most users, however, do not realize the cell phone's potential for education, nor even for the communication functions for which it was originally designed. Most educators still see the computer and the cell phone as unrelated devices, and the tiny cell phone more as a personal accessory, especially for young people. With falling prices and increasing functionality, however, it is virtually certain that not too far in the future all of the world's students will have a cell phone. This is sufficient reason and motivation for educators to explore the possibility of making the cell phone an important tool in the educational systems of developed and developing countries. This article describes the experience of two major projects that are studying the potential of cell phone and short message service (SMS) techniques for formal and nonformal education in the Philippines and Mongolia. The studies have yielded positive reactions from students and trainees about the potential of these techniques, and are suggesting design and logistical principles for use in educational cell phone implementation. (Contains 5 tables.)