How should the format of a message change for viewing on a mobile device?

Think in small chunks.Remember that mobile users consume information one screen at a time,so try to divide your message into independent,easy-to-consume bites.If readers have to scroll through a dozen screens to piece together your message,they might miss your point or just give up entirely.Make generous use of white space.White space is always helpful,but it's critical on small screens because readers are trying to get the point of every message as quickly as possible.Keep your paragraphs short (4-6 lines),and separate them with blank lines so the reader's eyes can easily jump from one point to the next.Format simply.Avoid anything that is likely to get in the way of fast,easy reading,including busy typefaces,complex graphics,and complicated layouts.Consider horizontal and vertical layouts.Most phones and tablets can automatically rotate their screen content from horizontal to vertical as the user rotates the device.A layout that doesn't work well with the narrow vertical perspective might be acceptable at the wider horizontal perspective.