1) Be Visible: Flash, PNG-24 images, and a host of plug-ins make much of your content inaccessible on many mobile devices.
2) Scale to Size: Use responsive web design to determine what type of device consumers are using to access your landing page, and scale the content appropriately for them.
3) Be Concise: Six-word headlines are so last year. Three- to four-word headlines are all the rage. Write your landing page copy, then cut it in half.
4) Be Available: Adding click-to-call capability -- the ability for users to literally click on your phone number on your mobile landing pages -- will help you with mobile conversions.
5) Think "Two Thumbs Down": Make sure the items on your landing page a user needs to click on are thumb-friendly.
6) Be Slim: Present your content in a single column and, whenever possible, keep your call-to-action above the fold, which is within the top 100 pixels for smartphones.
7) Think Local: Even the broadest of geotracking systems locate users within 5 to 20 miles of where they are, so use the local nature of mobile to make your landing pages more relevant to consumers
8) Use Simple Forms: Keep your forms to the bare minimum needed to get the job done. The simpler the form, the fewer the fields, the better.
9) Be Fast: The data on your mobile pages should be lean, lightweight, and under 20 kilobytes so your pages load in 5 seconds or less.
10) Get to the Point: The fewer actions a user has to take to get to their reward, the better.
11) Be Legible: Don’t sacrifice size for content.
12) Don’t Trust. Test: A/B test your mobile landing page.