Below is a chart of phone activity over 3 months, compared to day of week and time.

Tuesday is the least active day.

Since this chart is heavily biased towards the outgoing caller's personal behavior, I then removed all outgoing calls from the data. The results are below.

As we can observe, there is significantly less activity on most weekdays, as might be expected. There are a few points of interest in the data:

• Thursday activity, which can be attributed to the schedules of the contacts
• An early afternoon double peak on the weekend