Many databases are easy to use on mobile devices. Some databases have specific apps.
Encyclopaedia Britannica Online
Find this app in the App-store. Just start it in one of the university buildings and you can use it everywhere during three months. When this periode ends you open the app once again in one of the university buildings.
This e-Journal portal from Springer gives fulltext access to 2500 peer-reviewed publications and 48.000 books. Springerlink is available for iOS and Android devices.