Designing for Mobile

Some elements need to be considered while designing for mobile:

Physicality and Specifications

• Touch screens: gestures, hit areas, orientation, transition methods. 
• Small Dimensions: device guidelines, design and style guidelines.
• Connectivity

How, where and when

• Viewing conditions
• Distractions

How we behave and feel

• Mobile devices give us a new sense of freedom and control
• Mobile devices as an extension of users' own body and personality

Source:
Designing for Mobile, Part 1: Information Architecture by Elaine McVicar
Mobile and tablet specific guidelines - Part 2 Design considerations by Elaine McVicar