“Keep it short and sweet because if you don’t, you’ll get ignored.”
Christopher Elliott shares some good practices and etiquettes for sending e-mail messages to and from cell phones. Excerpts:
1. Begin messages with a one-paragraph summary of the entire e-mail, so readers on mobile devices can get to the heart of the issue immediately rather than scrolling down a tiny screen.
2. Keep your message so short and to the point that opening the actual message is unnecessary. For example, instead of a message header "call me, please," you should say "problem: pls call (your number)."
3. If you know you’re sending to a PDA (or mobile phone), mark your calendar to follow up with that person soon afterward, either by e-mail or phone. Because no matter how compelling your headline or your text, there’s still a good chance it might be forgotten.
Related: Email Etiquettes for Everyone