This message "No data sources available" means you didn't started to use the phone, and its apps.
Try to send/receive some sms or phone call, listen songs, take pictures, drink water...
(using the apps)
Then you will see some dots in orange and purple taking more and more size over the days.
What is it?
The main circle is the month.
White dot with the arrow is today.
Other orange and purple circle are the number of time you were active in the activity described by the sentence you can read in the middle.
The biggest circle will be your biggest time active in that activity (if it was 42 hours, minutes, pound, number of sms, music or any units, then 42 scale for the biggest circle, and other will be between 0 and 42)
Every day in a month, "today" will replace the last size (value) of the last circle with the current.
If you double tap inside the big circle (where stand the sentence) you will be able to change a source (sms, pics, call, ...).
If after using some apps you still having the message "No data sources available", please add your +1 (the link "Does this bug affect you? ") in this bug: https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1286276