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Swiping from right to left or tapping the arrow reveals the second main display on the device where you will find all the apps loaded on the device in alphabetical order. In addition to apps, you will see each individual email service appears as an app.
The basic phone dialer is pretty lame with no smart dial feature. This is one area where Microsoft needs to do some work before launching.
In the Tech Preview, tapping the Phone app takes you right to the call history part of the application.