Here are two of my favorite tips from the book:
"Mobile learning is all about context: where the learner is located and what they are trying to do at the point of learning. Start any content design, app development, or lesson plan from where the learners are and what their needs are—and don’t be trapped into a non-mobile lesson structure," Geoff Stead
In terms of my own English language students then, I think about using context to help them practice their English. I can SMS them and say "Tell me where you are. Be as descriptive as you can. Record it (or type it) into your phone now and give me the coordinates." Or "form three questions about where you are now..." or I can ping them with some coordinates - a mystery place - and give them a task to do when they arrive... or I can have them take photos where they are of three things that are as big as a laptop or more expensive than a laptop or older than laptop technology or... well, they could practice almost any language structure using almost any location, couldn't they?
And here's my second favorite tip from the 61 Tips:
"Think in minutes rather than hours for mobile learning," Carol L. Cohen