We use our mobile devices more and more for work, business, school and more. Tony Vincent has a great site, Learning in Hand, where he has been posting information, tips and resources about using mobile device in learning for years, starting with the Palm PDA's.
He created a great infographic with his tips and tools for mobile productivity. It has some great information for teachers and students, and anyone else for that matter, for being more productive using mobile devices.
Here is the infographic and you can download it from his site. Also check out the other great resources his site has.